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1.
A phrase used when you think something is right but you really don't know jack shit.
Guy 1: Is my wife home from here business trip yet? I'm planning on bringin' some chicks over for a party.

Guy 2: I'm 99% sure she isn't.

Wife: I've been here all fucking day you asshole.
by Jay Danger April 24, 2008

Words related to 99% sure

% 99 99% 99 percent dumbass dumb comment jack shit not sure