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1.
Whacking off while taking a shit, closely related to a blumpkin
I was scarr3d for life when I walked in on the old man blumpkinbating.
by Unachonger March 19, 2005
 
2.
Jerking off when taking a shit.
I love blumpkinbating all over Katie Morgans Face!
by M4r50cc1 November 18, 2009