Knuckle blast 

When you're fingering a chick and really gettin in there

You slammed your finger in a door? How are you gonna knuckle blast that chick?

Knuckle blast by Bearwook September 2, 2016

Knuckle Blasting 

Getting a tattoo of letters on each finger (generally excluding the thumbs) in order to spell a word or words about eight characters in length. The tattoo goes between two knuckles per finger on the outside of the hand.

"I had a little knuckle blasting session last weekend at the tattoo shop. It says 'hold fast' because I'm a sailor."

Knuckle Blasting by Symmetria May 22, 2014

Knuckle-Bastards 

Semen discharged from an act of self-gratification, usually left to dribble over the thumb of the active hand.

I was in the bathroom after your mum took a shit, so I thought I'd use that time to fire off some knuckle-bastards.

Knuckle-Bastards by FormerSmurf April 7, 2015

european knuckle blaster 

To shove ones fist up anthers anal rectom and snap inside the rectom, the other participants then shits, afterwards the two participants go out for chocolate ice cream.

Damn, he sure gave me one good European knuckle blaster last night.

european knuckle blaster by Jeff Steelflex March 12, 2015