Top Definition
Someone who has only a mustache with no other facial hair or sideburns.
His justache looks like he's sniffin a sick caterpiller
by Dan November 30, 2003
Moustache without a beard, goatee, or any other facial hair.
Alex: How many justaches do you think we'll see at the Cork tonight?

Tyson: Over/under is 3...and I'll take the over. Think I just saw Magnum P.I. walk into Jam Session.
by joejak22 July 10, 2010
When teenage boys begin to grow their first facial hairs and refuse to shave them, thus growing nothing but a pathetically small mustache/ some chin hairs.
"Is Justin on drugs??"

"No, just growing out his Justache"
by Katie I guess July 27, 2016
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