1 definition by Duke Lacrosse
when you are trying to have sex with a girl but you don;t have a full erection, so you grab and squeeze the base of your dick and try to 'mash' it into the girl in hopes of stuffing it in and getting an erection
beau was having trouble dr'ing this girl because he was too drunk, so he used the monster mash method.
by Duke Lacrosse April 27, 2007