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!
Bro #2 No way!
Bro #1 Yeah Fr, looked kinda like my grandpa!
by Ryangr8n August 29, 2019
by Avery Longie September 27, 2007