Top definition
When you see or hear about something that is painful and you get kind of a "jolt" or a "surge" inside. This usually occurs in the "buttal" region.
1. Oh, thanks A LOT for describing how deeply you cut your finger! That totally gave me a Butt Zert!

2. I get a Butt Zert every time I see some testicular injury scene in a frat humor movie.
by Jezebel Vandersnatch October 16, 2009
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The vengeful act of crapping on a lover's chest while they sleep.

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