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1.
The act of staying up all night while playing Super Smash. Bros. Brawl.
Man 1: What did you do Saturday Night?
Man 2: I pulled a Brawlnighter.
Man 1: LAWL NERD
by From: ELEKIDx February 19, 2008
 
2.
An all night party playing Super Smash Bros. Brawl, for the Nintendo Wii.
Man, that Brawlnighter was intense!
by Kitoro February 19, 2008
 
3.
Spending an entire night playing Super Smash Brothers Brawl with your friends, in a spirit similar to an all-nighter, usually accompanied by massive amounts of work or study.
Man I didn't get a wink of sleep last night; Me and my buddies held a Brawl-nighter.
by Lutzburg February 19, 2008