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When two friends sit back to back in computer office chairs and begin masturbating at the same time. Then after a set amount of time, both turn around and fire their loads at each other.
A:"Hey dude I'm bored."
B:"Yeah, me too."
A:"Want to duel?"
B:"Sure, I love dueling!"
A:"Ready? Set. Go!"
B:"Aww man. I lost. Good game!"
Dueling by Best Friends Forever September 11, 2010
When two episodes of the same show are on different channels at the same time
Shit, there's dueling Seinfelds on. Should I watch the one with a misunderstanding and hilarious consequences or the one where there's a misunderstanding and hilarious consequences?
dueling by typical May 15, 2006

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 Batwings 

I Walked in on these lesbians dueling batwings, it was the time of my life.
Dueling Batwings by brenten kelly January 17, 2008

Dueling Away Messages 

When using AIM or a similar instant messaging service, and your away message comes up in response to someone elses away message.
Twitch: ok, just finished Caprica and the 1st actual episode.... I know you've been telling me this s***t for years, but damn, Battlestar = pretty damn awesome.

Auto response from george: Away

Auto response from Twitch: I am away from my computer right now.

Twitch: dueling away messages!
Dueling Away Messages by erictwitch November 24, 2009

dueling snakes 

The act where a friend and yourself whip out one's penis and slap it on someone's passed out face at the same time.
Guy 1- "Whoa...John passed out again, wanna give him the dueling snakes...no homo?"

Guy 2- "Sure bro, it's what he gets for drinking the rest of my whiskey anyways"
dueling snakes by lolololol40 January 23, 2011