The act of ejaculating on a sexual partners upper lip after felatio in a mustache like fashion.
Kayleigh said she wouldn't swallow so I gave her a moistache.
by Sarkyninja July 20, 2013
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Typically, a man's mustache grown to the point that it is panty dropper to say the least. It is as thick as it is long, and as full and lustrous as one could possibly dream of. It is a walking advertisement for mustache rides. Which only make it grow even more thicker.
Those hipsters are really trying to grow mustaches, but Thomas Magnum has a true moistache. You can tell by the way that it is. Sploosh!
by Karl Hungus January 10, 2023
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The residue that is left on an upper lip after performing oral sex on a female.
Dude, I just that stupid hot girl from work out on a date and she gave me a moistache!
by Elmore0394 April 1, 2019
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What a man with a well-groomed facial feature gets when he provides oral stimulation to the female genetalia.
"man, I really like having this moustache. But I'm tired of it becoming a moistache when I go down on chicks. Especially when I can't find running water for a few days"

"The well endowed moustache man was inexplicably rewarded with a moistache after pleasing the old woman's nether-regions"
by supertrooperdude_69 January 20, 2010
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1. used to describe a moustache saturated with a liquid of any origin
'Moisssssstache' uttered after successfully concluding an oral action with a resulting by-product of a moistache
by Sir Szylliam July 11, 2022
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