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.
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?
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