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1.
1. to cause a ruckus

2. to play a decietful trick
after i drink my beer, im going to go pull a shenanigan
by poophead March 26, 2005
 
2.
When you dare someone to do something. Also is a synonym for 'bullshit'.
1. Dude: I'm totally asking out that girl.
Bro: SHENANNIGANS!

2. Dude: I totally just asked out that girl.
Bro: Pfft, shenannigans.
by merrinator November 04, 2009