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The coating that remains on the upper lip after drinking a glass of milk.
After drinking a glass of milk, the little girl said, "Look mommy, I have a milkstache!"
by Avery Longie September 27, 2007
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Aug 11 Word of the Day
A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.
"My boyfriend has a total case of brain worms. He told me the cat was bugged so the Feds could listen in on us having sex..."

or

"You totally stumbled over that entire sentence. Can't speak English all of a sudden? What, do you have brain worms?"
by _Jez_ October 03, 2009
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2
When you cum on a girls face, particularly around her lip, to the point where it looks like a moustache
Bro #1 : Bro she let me milkstache her last night
Bro #2 No way!
Bro #1 Yeah Fr, looked kinda like my grandpa!
by Ryangr8n August 28, 2019
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