Top definition
The act of fingering a girl on all fours with both hands, one from the front and one from the back to have your arms form a letter "M".
Someone put up a awesome shot of Sally getting a McArch Nasty in the Starbucks bathroom online. She's a whore.
by Jiggamanflossin November 18, 2010
Get the mug
Get a McArch Nasty mug for your father-in-law José.
2
The act of fingering a girl on all fours with both hands, one from the front and one from the back to have your arms form a letter "M".

Invented in Cohoes, NY Winter 2001.
Someone put up a awesome shot of Sally getting a McArch Nasty in the Starbucks bathroom online. She's a whore.
by Jiggamanflossin November 18, 2010
Get the mug
Get a McArch Nasty mug for your father-in-law Paul.