When the person receiving a blumpkin drops a huge turd and the person giving the blumpkin gets a huge splash of shit water on the underside of their chin; When the person giving a blumpkin gets water splashed on their face from a dropping or exploding shit.

Kerplunk + Blumpkin = Kerblumpkin
I need to wash this shit water off my face because my boyfriend gave me a gnarly kerblumpkin.
by BSleepy June 11, 2010
11 Words related to Kerblumpkin
true love, getting a blowjob while on the toilette
my g/f gave me a kerblumpkin yesterday!
by UsedCarMan August 29, 2005

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