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1.
Having a very unique penis that all of the ladies love.
See that guy? He's got the Valvo dick.
by Funky Buttlove July 10, 2008
 
2.
Valvo... The unintentional act of being mysterious. vague, ambiguous, flaky or unconventional
The mistress was so uninterested in the party and it's guests she came across quite valvo.
by Cjoval April 12, 2007