qualified to sing
synonomous with "I just had sex" it comes from the song by The Lonely Island. Used to describe someone who, big surprise, just had sex.
Socially Awkward Penguin: Watching video by the lonely island . . . parents walk in, are qualified to sing
guy1: Dude, I'm totally qualified to sing
guy2: brooooo! nicccceeeee!
guy1: Dude, I'm totally qualified to sing
guy2: brooooo! nicccceeeee!