Anal sex that is messy and stains things.
Skeeter did stainal with his sister on my couch now it's ruined!
by WuddupBreh? November 18, 2015
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When two or more parties leave evidence of having anal sex without proper bowel evacuation resulting in an awful mess.
I met this kinky chick who never used the word no. Not wasting any time, I put all the love I had in her ass but she sent it all back. Now I have to buy a new mattress before my parents get home and find out I had Stainal Sex in their bed.
by Stevie LaLa January 23, 2016
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