Made famous by Jimmy Pop of The Bloodhound Gang in the song "A Lap
Dance is so Much
Better When the Stripper is
Crying", it essentially means the cock entering the vaginga.
"So, Bambi's goin' on about how she can make all my fantasies come true.
So I says, "Even this
one I have where
Jesus Christ
is jackhammering Mickey Mouse in the doo-doo hole
with a lawn dart as Garth Brooks gives birth to something
resembling a cheddar cheese log with almonds on
Santa Claus's tummy-tum?"
Well, ten beers, twenty minutes and thirty dollars later
I'm parkin' the beef bus in tuna town if you know what I mean."