look up any word, like half chub:
 
2.
The puffy, mustache shaped skin resembling a bald mustache on some guys upper lip.

"Hey Dude, did you shave your mustache?"

"No, I just covered it with concealer."

"Yeah, Wow, I really didn't notice."

"Skinstache."
by captainscurvypants November 01, 2006
 
1.
This is what occurs when a woman has been tanning in the sun or with sunless tanner, and has her upper-lip waxed. Waxing removes the top 3 layers of skin, therefore removing the tan and leaving a white "skinstache".
"Oh dear, I shouldn't have gone tanning and then have the salon wax my mustache! Now I have a skinstache."
by Deanna03801 February 25, 2009