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The act of ejaculating on your sex partners rectal area and then proceeding to let it air dry so that it leaves a layer or crust.
The lady I picked up at the bar last night fell right asleep after some anal action, she didn’t have time to clean up so her butt hole was totally ass casted.
by JorJorBlinks March 19, 2018
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v: The act of sticking a limb with a cast on it into your ass or another person's ass.
n: A cast that is in an ass.
Dave: I had a weird experience last night.
Tom: What happened?
Dave: I got an ass cast from my girl friend.
Tom: Aw, man! How thick was the cast?
by JustStoppingBy November 28, 2009
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