verb. vulgar, disgusting, displeasing.
Relates to the face you make while witnessing something sickening or repulsive.
Did you see what that moon cricket left in that spackle bucket? That shit is mad yuckmouth.
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Similar to being "off the chain," it is a unique way of describing something awesome, out of control, badass, etc.
Can be shortened to "off the bub."
Mark: Yo, I took that blonde bitch on a Polish Bicycle ride last night.
Drew: Damn, that shit is off the yelzabub.
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