It litterally means "I had sex with your grandmother last night."
It just removes the word 'sex' to make it shorter, like any other slang term.
It just removes the word 'sex' to make it shorter, like any other slang term.
Ryan: "Yo man, what were you doin' last night?"
Jack: "I had yer grandma last night"
Ryan: "What the hell man?! That's sick!"
Jack: "I had yer grandma last night"
Ryan: "What the hell man?! That's sick!"
by jeNANANANANAA BATMAN! April 11, 2009
Get the I had yer grandma last nightmug.