When one person has a dick in his or her mouth. Also works for Chest Nuts, Ear Nuts, or Rib Nuts.
"Sugar daddy if i had nuts on my chest would those be chest nuts?"
"Oh Hell yea"
"Sugar Daddy if i had nuts on my chin would those be chin nuts"
"Oh hell nah bitch you got a dick in your mouf"
When your bro makes an statement or observation that is very obvious, you respond with; ChinNuts!!
This is due to the fact that if your nuts are on her chin, your dick is in her mouth.
Bro, did you get that text from Rob?
Yeah Bro, he’s one perverted dude!
Chinnuts!!