Girlfriend, Gay, or Gross. If you're a single lady, one of the three G's, or a combination of the three, will keep you from meeting the guy of your dreams.
Cady: Man, Taylor is so gorgeous. Too bad he's gay.
The three G's is used as a threat and also as a finishing move for a fight. The three G's gets its name from the 3 moves performed that result in a win for the user. These moves are a Good left, a Good right and Goodnight.
I had a fight with this bloke in the pub the other night. He was giving me abuse so I gave him the three G's