To fuck a girl so hard that her head goes through a wall, then your buddy on the other side of the wall sticks his dick in her mouth.
"Hey girl, whats wrong with your head?"
"I got Man Slammed."
"You should have been wearing your Viking Helmet."
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A video or movie that involves The Grinch from How the Grinch Stole Christmas.
"Yo dude, the new Slam Man just came out!!"
"No way!!"