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1.
Someone who is alright with one person doing something, but is totally against another person doing that same thing.
"Hey Serah! Watch me do the robot."

"No doing the robot is stupid...unless Bobby does it."

"...Stupid crackit..."
by Romedog March 16, 2013
 
2.
To get angry and upset.
He'll crack it if you do that!
by BunnyRabbitSex July 22, 2012