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1.
The punching of someone's asshole. The objective is not to actually enter the asshole, but usually as a retaliation when noticing that one's partner is about to defecate on one's face or chest during physical relations.

It can also be used in a more general sense when punching someone's exposed asshole for a myriad of reasons.
That dude was about to lay a Cleveland steamer on me, so I gave him a chocolate shank.
by Ross Sewage October 25, 2006