Similar to beer goggles, when girls that look like shit are infinitely more attractive to a dude who is drunk off his ass.
"Dude did you guys see Nick last night, he totally had shit specs on when he was grinding on that whale!"
"I left my shit specs at home, so I might actually fuck a good looking girl tonight"
gfln- girl from last night
mostly used in a derogatory tone. the gfln typically refers to a whore which may or may not have been a mistake to hook up with
"dude.. my gfln has been bugging the shit out of me today!"
"you shouldn't have tapped that bro.. you never know when your gfln will come back to haunt you"