The still-attractive breasts of a mother. May be displayed prominently or left hidden for the imagination to discern. More attractive than mommaries.
"I am truly jealous you got to suck on those tits when you were a baby." - Seth to Evan on his mom's mommy knockers, Superbad, 2007.
by Awnlooker May 14, 2010
n. a motherfucker from Maine.
A guy who boosts your lobster traps is a real mommyknocker, eh?
by El Martillo February 03, 2008