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Kerplunking 

Where one or more people hang from a miscellaneous object.
Lucy and Adam were sick of planking, so instead decided to try out kerplunking.
They kerplunked from a tree branch.

fuming kerplunk 

When you take a big shit and put it into the gas tank of somebody's car
Jim:Hey man did you get back at Bob for fucking your girl yet?
Tim:Yeah man no worries I gave him a fuming kerplunk
fuming kerplunk by Metzfreak February 3, 2014

Kerplunker 

My girl gave me a kerplunker last night.
Kerplunker by Angelo00 September 1, 2021

kerplunk 

When five men have intercourse with five seperate partners, or perform dual penetration on a shared set of partners with one "odd man out", using one shared latex rubber glove as a prophylactic. The term is derived from the Mattel brand game, Kerplunk, which also involves many rods crossing, and balls dropping.
This weekend, Tom, Dick, Harry, Barry and I kerplunked with Susie, Mary, Annie, Liz, and Frank.
kerplunk by Idle July 24, 2008

kurpluncked

That guy was so kurpluncked last week after the party!
kurpluncked by toddO13579 April 29, 2008

Kerplunk 

The sound of witch a shit comes out of you anus and drops into the toilet making a "kerplunk" sound and also can cause splashing the butthole.
Just made a kerplunk in the toilet.
Kerplunk by ZittsViaCoo January 31, 2017