To masterbait with an un-know substance , such as snot from nose , or car oil , or things found on the table at lunch and use it as a "dirty scott"
We found some slimy stuff on the ground so i did a dirty scott
by Josh whaileer February 17, 2008
To be dancing with a female at a party as a male, and start having manual sex with said female against a wall.
"Dude, this chick was grinding on me so hard at that party, I just had to dirty Scott that bitch. It was fucked up."
by THE Dirty Scott October 30, 2011