Top definition
A mustache worn or grown only for a particular occasion. Most likely in the pursuit of awesome.
1) A classy event you say? This calls for a circumstanche.

Bob: Hey Fred, have you always had that incredibly awesome mustache?
Fred: Yes, but I only wear it under certain circumstanches.
by omegamjolnir January 18, 2011
Get the mug
Get a Circumstanche mug for your mama Riley.