Top Definition
the act of inserting the index finger into the rectum 2 knuckles deep.
Johnny has his finger 2 knuckles deep into his rectum therefore he is knucking
by icecreambandit March 17, 2013
3 Words related to Knucking

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×