Funk Stache 

When your mustache smells so bad the day after eating out a spoiled tuna taco you have to shave it to get rid of the smell.

Rugged was rudely woken up by his Funk Stache the night after a box lunch at the vagina diner with a hefty German chick in the park, so he was forced to shave it and grow a new one.

Funk Stache by Bookbagman December 5, 2017

Fuckstache 

When an individual trims his pubic hair in the shape of a mustache.

So I heard Andrew trimmed himself a fuckstache yesterday. Badass.

Fuckstache by FacelessPuppets May 6, 2011

Fuckstache 

When a guy with a fierce 5:00 shadow engages in a sexual situation with a woman where he has pationately kissed her lips for such a period of time that his scruffy mustache has unknowingly given the female an extremely tender crusty abrasion or pink strawberry on her upper lip, hence the term fuckstache.

"Looks like someone came home with a fuckstache!"

"Ewww girl that fuckstache looks like a bleeder.."

"Don't kiss me! My fuckstache is super tender!"

Fuckstache by Fashtastic Me January 19, 2014

Fuckstache 

Of or pertaining to the styling of ridiculous, filthy and generally inappropriate facial lip hair...See, any one of America's fine motorcyle cops.

"Hey James, when are you going to shave off that ticklin' fuckstache?"

Fuckstache by Karch December 25, 2003