Sustache 

A swath of facial hair grown to ward off enemies and, consequently, any potential mates;

When a mustache is unavoidably suspicious & disconcerting.

"Is it just me or was that UPS guy giving off some kill-you-in-blue-lipstick vibes?"
"Don't overthink it -- he's just sporting a major sustache."

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"I almost had her number," Stuart thought to himself.

He didn't realize his sustache was ensuring his worst fear of dying alone.

Sustache by Menorah January 8, 2015

substache 

a temporary fake mustache one uses while waiting for his/hers to grow in thicker

"I started Movember fresh so I had to use a Mr. Potato head substache till I caught up"

substache by Mr Roboto234 November 2, 2011

reverse sunstache 

When you have a moustache and get sunburn but then shave it off, leaving paler skin on the upper lip. Opposite of a sunstache.

Look at that faggot's reverse sunstache.

reverse sunstache by ClemTheOctopus June 8, 2016

sudstache 

The remnants of a frothy beverage left upon your upper lip.

Gary went over to hit on that woman, but he had a sudstache from his beer! He was totally shot down!

sudstache by NuttyByNature June 20, 2009

Sunstache 

A mustache that you get from sunburn or tanning by not using sunscreen. Happens to many people and looks oddly disturbing on females.

My sister has a Sunstache from getting sunburns at the beach. We tell her to put sunscreen on, but she wouldn't listen, and she was shit out of luck.

Sunstache by Fuck you pay me fuckers July 15, 2014