Party Pumper 

A person who brings hype and enthusiasm to a party, who helps break the ice so partygoers have a good time.

My university's student newspaper always had wanted ads for 'party pumpers' to work at bar/bat mitzvahs getting the kids dancing and enjoying themselves.

Party Pumper by sallyhousecoat February 10, 2012

panty pumper 

A guy who likes to grind his penis into a woman's ass while she is still wearing her panties.

Most panty pumpers love to have sex with girls who wear skin tight panties.

Panty Pumper: Boy, I'd like to pump her panties !

panty pumper by Duckman16 October 13, 2014

pamper party 

a loser who is over 18 who likes younger girls and invites a bunch over because he can get them booze.

your man had a massive pamper party at his house.

pamper party by cappa49311 November 10, 2009