The "art" of rubbing your hands on your sweaty ball sack and then proceding to slap your buddy in the face, and then watch the signs of embarrasment on your buddy's face.
Note: Could result in anger.
You: "Dude do you smell something?"
You: "Do you want to?"
Friend: "(sarcasticly) go for it."
You: *perform action* (followed by) "My good man, you have just been a victim of cheddaring."