When you are being jack you are dismissing someone by claiming you don't know them.
I'm being Jack with Chris by acting like I don't know him
by Timamartimez20 November 13, 2019
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This is when someone (usually named jack) is hiding their sexuality for example they are gay but will hide it and make fun of other heterosexual males calling them gay on the off chance he can convert one of them so therefore when he comes out the closet he isn't alone.
Hey you, why you being a Jack? No one likes a Jack.
by nijardan10 March 30, 2020
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Being unbelievably stupid and saying dumb things
Person 1: Hes not ethiopian hes christian
Person 2: Stop being a jack
by Animeuser1234 February 11, 2020
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