duelling 

When you and your friends get together and ejaculate on his/her boobs

O that guy is duelling just like Katy Perry and he liking it

duelling by Pseudosciences are also used September 13, 2017

Duelling Turds 

The art of sliding a double ended dildo back and forth between two anal cavities using only farts and turds.

Did you hear Mike took both of those girls home last night?

Yeah rumor has it he stopped at White Castle for a crave case and then watched them play Duelling Turds!

Duelling Turds by SilkyMeatloaf July 22, 2019

duelling banjos 

female masturbation race.

Clarice(to Michelle) 'Do u want another game of duelling banjos? This time I'll win!'Michelle 'Don't count on it!!!'

duelling banjos by hornskull December 5, 2003

Duelling Peacocks 

When two men joust for top sartorial spot using their wardrobes as objects to challenge each other

Who's the new guy?
Oh, that's Brian - he's challenging the boss for top sartyr.
What do you mean?

Check out the duds - he's trying to outdo the boss.
Who's gonna win.
Dunno, but there will be blood when there's duelling peacocks in the office...

Duelling Peacocks by Carl Davidson August 21, 2013

Duelling Beards 

Aggressive competitiveness and/or one-upmanship between GNU+Linux experts for recognition or superior technological prowess; particularly due to seniority in the field.

Our LUG meetings are nothing but a bunch of duelling beards arguing over whether Slackware or LFS is the true operating system.

Duelling Beards by BillyLO June 8, 2009

Dick Duelling

The act of yourself and an opponent perfectly aligning your penises and urinate as hard as you can, so that the two jets hit eachother. The winner of the duel is whomever lasts the longest, or manages to defeat their opponent by pushing their stream back.

“Enough of this, let’s settle this like real men! Through Dick Duelling!

Dick Duelling by Carnefice November 5, 2017

Dueling Harmonica 

Two individuals, undefined in orientation and/or gender, each partaking of one half of a mans penis, divided lengthwise, by means of oral suction.

After a heated arguement, they decide to compromise and perform the dueling harmonica.

Guy 1: Yo, these two babes shared my donicker last night.
Guy. 2: You mean they gave you a dueling harmonic?
Guy 1: Yeah, I guess.

Dueling Harmonica by The College Board April 14, 2008