Top Definition
To defecate into the anus of another person then tenderly stomp the feces down into their anal cavity
This creates a coinshaped crap compacted into the companion.
Please see wafflestomp for the origin of this practice.
For maximum impact, the turd should be a solid.
Diarrheal coinstomping is a whole different practice.

The percentage of people interested in the coinstomp fetish has greatly increased during the past 2-9 years
While Tofundi was dreaming about unicorns and the delicious taste of the rainbow, I tenderly coinstomped my fermented shit into his ass.
by Koinage December 07, 2010

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