this is when a guy is taking a piss while getting a rim job. as opposed to a plumpkin which is a BJ whilst taking a shit.
bob was peeing in the woods when susan came right up behind him & began eating his hairy ass out, aka a kerplunk.
by seaseperating January 25, 2022
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When your well endowed and it hits the toilet water.
When I was taking a crap and yup "Kerplunk".
by Willy_d_ March 25, 2017
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