verb; when you forcefully go knuckle and/ or wrist deep to successfully penetrate ones' anus. (leaving you with dirty knuckle)
Sean- "what the f**k is on your hands?
Kevin- "I gave my girl a dirty knuckle last night, I guess I missed a spot"
Kevin- "I gave my girl a dirty knuckle last night, I guess I missed a spot"
by big pimp nasty September 15, 2013
Get the dirty knucklemug. by Anggelos April 7, 2015
Get the dirty moose knucklemug.