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Hold my juice box. The child version of Hold My Beer (hmb) which is said before doing something stupid, typically under the influence of alcohol.

Made popular by the subreddit reddit.com/r/holdmyjuicebox which features gifs and videos of children doing stupid things.
kid 1: Should I try to fit all of these crayons in my undies?
kid 2: I bet you can't
kid 1: hmjb
by DAMP_PIGEONS June 26, 2017
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