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 07, 2021

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