When you get aroused so much that your ass cheeks automatically clench and can't stop!
Man: Nice Ass!
Woman: Thanks! I Shaved It Yesterday.
*Anal Erection Begins*
by AlexPower August 16, 2008
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The act of shoving a flaccid penis into the ass of someone of any gender, and getting an erection with the penis already inside of the ass.
Guy: Hey babe, wanna do anal?
Girl: I'm afraid it will hurt too much...
Guy: We can try an anal erection.
by Old_Ben January 3, 2018
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