Top Definition
The celebration of mustaches (spoken: moo-stashes). All kinds. Bashio translates into "bash" like a party, a party for the phenomena we know as the mustache.
"Hey coming to the mustachio bashio at Derek's this weekend?"
"Hell yeah dude, I wouldn't miss out on the possibility of a mustache ride"
"Dirty sanchez for life!"
by Clusterfudge March 04, 2008
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