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Literally, drooling with saliva.

A vavoso or vavosa is one incompetent and slobbery pig of a human being. It can be used interchangeably with pendejo, although it is slightly harsher.
One day after drinking himself retarded, Billy decided to impress the girls with a manly burp, but ended up vommiting over himself and scaring the chicks. Vavoso!
by Edem Fuggs May 07, 2008
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