A Pump Like Instrument, That Is Used For Clearing Out Ones Rectum, Prior To Anal Sex.
John: Ima Do Her In The Arse Later.......

Tom: Make Sure She Bum Pumps First, Otherwise, She Will, Without A Doubt, Dirty On Your Cock Stick...
by Buperter August 6, 2011
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A male who pokes another males ass relentlessly with his piece
Mike was bum-pumping Liam
by 7841sugnuf May 26, 2010
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