When one or more people share the same type and colour of moustache.
Wow, What a random happenstache, your moustache looks like mine!
by LibiMuffin June 5, 2010
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Facial hair, especially on the upper lip, that grows due to laziness.
"I came by this stupid hipster look purely by happenstache."
by jmunchie February 20, 2012
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