Acronym for Toxic Guy Syndrome. When a guy, despite having a girlfriend, tends to let his lower
head's thoughts overpower his upper
head's thoughts. Basically when a guy thinks with his penis instead of his
brain.
Guy 1 :
Hey, man I
haven't seen Stephanie around in a while.
Guy 2 : Yeah, bro, I think I have TGS.
Guy 1 : Oh, you cheated on her?! With who?
Guy 2 : Some hot piece of ass I saw at a
party last month.