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."
Giving your significant other some sexual healing
Sorry im late for the meeting, me and Brenda were up all night waxing the earhole.