This is a gang ladies bang baby bang tell me what you need, oh
Any motherfucka wanna disrespect
Playin' with fire finna get you wet
How that feel down there on your knees, huh
Trip and it's goin' down down down
Girl I'm with you
If they get you they get me
So come on let's go
Bitch I'm with you if you if if you with me
I'm down for life
Loaded, reloaded and let's go
Gangsta for life
Till the day that I die yeah
I promise I'll stand and fight
Cause you know that I'm down, you know I'm down
Gangsta for life
We know where you stay
Know what you did
We don't play that shit nigga, we don't play no
Acting like a bitch finna get you hurt
Breakin' liars down to the knees, oh
Trip and it's goin' down down down
Girl I'm with you
If they get you they get me
So come on let's go
Bitch I'm with you if you if if you with me
I'm down for life
Loaded, reloaded and let's go
Gangsta for life
Till the day that I die yeah
I promise I'll stand and fight
Cause you know that I'm down, you know I'm down
Gangsta for life
Girls, check
Hell naw we ain't done yet
Got a lot to handle
We ain't took over the world yet
Better yet a navy
Better yet crazy
Guns in the air
Guns in the air
Guns in the air
Can't hurt us again when you come around here
We got our guns, got our guns
We got our guns, got our guns
We got our guns in the motherfuckin' air, oh
Gangsta for life
I'm down for life
Gangsta for life
I'm down for life
Loaded, reloaded and let's go
Gangsta for life
Till the day that I die yeah
I promise I'll stand and fight
Cause you know that I'm down, you know I'm down
Gangsta for life

Women empowerment, from the artist's/narrator's perspective.

love the beat to this song(:

This song is about her having her girlfriends back. She would do anything for her no matter what it is. She would kill for her girlfriends.

To me, this is a song that is both angry and threatening, yet vulnerable, at the same time.
A clue comes in the beginning: "Playin' with fire gonna get you wet How that feel down there on your knees, huh" is a reference to sex, violence, and perhaps, being humiliated.
Towards the end is another interest reference to feeling vulnerable: Can't hurt us again when you come around here" is an acknowledgment she has been hurt before and is now with her friends for protection.
Rhianna said it best herself in an interview: “I can tell you that making this album was my recovery. It’s the way I vented and expressed myself”

To me this song is a call to arms, telling people to wave their guns around in the air. She also wants to let everyone know that she is a gangster and always will be. It's a powerful message.

I agree with earthsun and MIMl101 to a degree. To me the song is using "gangster for life" in association with the permanent scar that heartbreak and pain leaves on you emotionally and the bond between friends, in this case, sisterhood. Think about it. Gangs, the only way out is death or being rescued/saved away from it. The lyrics:
" You know I'm down for life Load it, reload it, lets go Gangster for life Til the day that I die. "
Her girls are there to back her up in the sense of being her backbone. They won't allow anyone to hurt one of their own or else there will be trouble, they'll stalk out the target, guns will be drawn as the lyrics say, but the hidden meaning is clear:
" I got these girls like a solider Trip and it's goin' down down down
I'm ready to roll Girl I'm with you If they get you they get me So come on let's go Bitch I'm with you if you whippin, you with me. "
and
" I promise I'll stand and fight Cause you know that I'm down. "

I agree with everyone stating it's about women's empowerment and sisterhood. It also sounds like it's about a group of friends getting revenge for a woman who was in an abusive relationship.

The title of this song stands for "Gangsta For Life."
This track, which sees Rihanna sprouting a series of bad-bitch boasts then purring at the end "Revenge is sweet," was produced by London "dubstep" production duo Chase & Status. Saul Milton, a.k.a. Chase, told BBC's Newsbeat: "This album for her is just about what she likes and what she's into and what she wants