Abbreviated version of "in the goat ass." Taken from a line in Adam Sandler's The Goat Song: Fuck me in the goat ass.

Typically used to indicate when circumstances, happenstance, or luck are just not on your side. Not only have you been fucked, but you've been fucked ITGA.
Well, damn, fuck me ITGA.
by ronearc June 13, 2019
Get the ITGA mug.