grandmotherfucker

One who fucks a grandmother

Steve Stifler in American Wedding is a grandmotherfucker, since he fucks Jim's grandmother.

by Greg Pugh August 14, 2003

Grandmotherfucker

Also known as your grandfather.
Named for mating with his wife to produce children who then become parents of his grandchildren.

Ben: Me and my motherfucker just went to see my grandmotherfucker for Motherfucker's Day (also known as Father's Day).
Gregory: My motherfucker (or my father) is such a charm and treats you with love.

by gregben July 6, 2021