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."
Rihanna's fanbase are known as her Navy, after the lyric "We're an army, better yet a navy" from this song.