Top definition
The aroma emitted from your anal cavity when you've had one too many bean burritos from Taco Bell.
Mang, I shouldn't had that chimichanga--I've gotta let loose some wicked butt musk!

What is that? Did someone drop a deuce?
Nah, I think she just let some butt musk slip out.
by CGCS! September 02, 2008
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