Scottish Moustache 

refers to the bloody residue gathered above ones upper lip after having performed cunnilinigus on a woman during her menstrual cycle.

"Hey Jordan, what's up with your lip, bro? Did you cut yourself?"

"Nah, just haven't washed off the Scottish Moustache Sarah

gave me last night. She's still on her period."

"That's just plain f*uckin' gross."

Scottish Moustache by relaxfrancis October 15, 2009