Phenomenon in which one's consumption of alcohol makes physically unattractive persons appear beautiful. Gillis goggles is a more intense and severe version of the classic "beer goggle" phase. While "wearing" gillis goggles, literally anyone/anything is fair game.
Ross: "Dude what the FUCK were you thinking last night when you were dancing with that fat chick??"
Matt: "fuck you, she was pretty hot"
Ross: "no dude you just had a bad case of the gillis goggles again."