What is... Slap Juice?

Here's a short clip from my recent gameplay.
https://rumble.com/v2q74h2-my-return-to-fortnite-was-a-bit-rough.html
I Return to Fortnite after a very long Hibernation period. Will I succeed in taking down my foes or will I be overcome and destroyed? These were my first couple games back into it.... I probably should have refreshed myself with the controls before hand, Oops!

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Have a good one!