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49.
The name of a game played 24/7/365 by people who know of its existence. The game is played by first saying "Shenanigans", then, the person who said it is allowed to hit or otherwise hurt anyone within earshot of them at the time that they said it. The main target tends to be the groin on males and the chest on females. People who are within earshot when "Shenanigans" is said must say the word "Mulligan" as soon as they hear it to prevent being a target. If someone is hit either before or while you are saying the word "Shenanigans" or after they have said "Mulligan", you are considered to have cheated and they get a free hit on you. Note that saying "Shenanigans" lasts indefinately until each person within earshot has said "Mulligan"
Bob: "SHENANIGANS!" *smacks Tom in the groin*

or

Bob: "SHENANIGANS!"
Tom: "MULLIGAN!"
*Bob hits Tom in the groin*
Tom: oooh, that's a free hit! *smacks Bob in the groin without penalty.*
by Eric February 08, 2005
 
8.
Another way to call BS.
"Would you like to call shenanigans?"
"Yes Alex, I'll take shenanigans for 400."
by hswbdiuw January 26, 2008
 
9.
Used as an interjection, "Shenanigans!" denotes a person or event suspect of unscrupulous or dishonest conduct. If one believes they bear witness to such an occurrence, they should immediately call "shenanigans!" to draw attention to it.
There's no way he could have done that by himself...I call shenanigans!
by TheLastMuse July 16, 2008
 
10.
1. Silly Business
Gat durn it you hooligans! Stop with the shenanigans!
by zBurd October 18, 2009
 
11.
Tomfoolery, mischief, or other nefarious activities, often illegal
Tom: hey i'm having people over this saturday. we're going to kidnap a stripper. wanna come?

Bill: i don't know... i'm not usually one for shenanigans
by jibblesqid December 02, 2010
 
12.
A term used to call out acts of tomfoolery, or devious trickery.

Sometimes applied to the actions of Peter Griffin from Family Guy.
Cleveland: "what the hell?! No, no, no, no, no, no, NO!
... I gotta stop taking my baths during Peter's Shenanigans...."

Or

"Wait a minute, what happened to my chicken nuggets?

I call shenanigans!"
by Haywood Jasuckme September 29, 2009
 
13.
Shenanigans is the universal law of the universe, the law consist of just uttering the word shenanigans and any argument you are in you automatically win no question's asked.
The rule of shenanigans can be summed up as "I Win, You Lose, Fuck You!"
If you are getting robbed and the robber has a gun to your head, and you call shenanigans. The robber is obligated to put the gun down and walk away.

"Why the hell is there a bomb in your luggage?"
"SHENANIGANS!"
"Oh Snap! Hurry up then, the planes about to leave..."
by UniversalLaw May 11, 2010
 
14.
An extensive amount of foolish behavior, Constant acts of trickery. Also in reference to spontaneous mischief or calling "bullshit" on one's actions
I'm calling shenanigans on you, if you honestly think your getting away with robbing those group of black kids with a rubber spoon... ya dumbass
by AJ the Infamous April 30, 2011