Top definition
Upon sipping from the head of a fine beer like Guinness, the foam left on your upper lift creates a faux moustache appropriated by your fellow man as a foamstache. Commonly seen in fraternizing situations.
"Mmmm man, love this Guiness."

"Fritz you have a foamstache!"

"LOL!"
by DJSEAND August 24, 2009
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