Get It Pumped is not a slang term that has anything at all to do with sexual intercourse. Get It Pumped basically means to put something on (i.e. music, a game etc.) and can apply to a lot of things.
You find your Queen cd at a party
"Get It Pumped!"
While channel hopping you see Forrest Gump
"Get It Pumped!"
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To malky another person, i.e. to headbutt them.
Then WALLOP! Jiggy bunnet, right in the heid.