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This genital high five terminology originated in Northern California and was conceived as a subversive alternative in discussing sexual intercourse.

One does not throw pumps "at" someone, instead, throwing pumps is always mutually inclusive.
Did you throw pumps last night?

I'm so horny! just want to throw some pumps.

I was so tired today because I was throwing pumps all night.

Teddy and I threw pumps until mommy made me stop and clean up the stuffing.
by sea monster fulton June 12, 2010