So large that it can not be discribed as any other word.
There is a gigunguse storm heading our way.
by mike January 15, 2003
Often used to describe something that is so large it is not fathomable unless it directly experienced.
Black women only have two types of teeters; they're either really small misquito bites, or they are Gigungus tits, that make you lean back in your chair when a girl walks in the room.
by Super October 31, 2004