To piss out your ass into a toilet bowl creating the effect of a mud filled lake.
Dude, you got to come upstairs and check out the mud lake in my toilet.
by Ricflairsayswoo September 22, 2009
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The aftermath of shitting during or immediately following a rimjob.
Michelle left a mud lake on Toms bed while he was rimming her.

The mud lake was a nice relief after the rimjob Mike gave me.
by Moist oyster June 18, 2019
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