Stainky
The smelly, raunchey smell that is secreted from the butthole. May come in a variety of different forms. When released from the butthole it can travel miles infecting nearby people especially outfielders playing baseball.
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Stainky
Combination word of stained and stinky or stanky. Showing not only does the person smell bad but also their underwear are stained with shit.
Lamar is stainky. He has shat his pants thus causing them to be stained and stinky.