Slapped so hard you forgot everything you know, I.e., you don't know Jack..Jack-slapped
Person 1: Hey what are you doing?
Person A: Messing with the police.
Person 1: You're going to get Jack-slapped
by Nepuuuu January 1, 2020
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To strike someone quickly and with great power after initial irritation.
I wanted to straight jack slap that boy when he started frontin on your ass.
by Fes October 9, 2003
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Present tense for slapping someone so hard they don't know jack diddley

Jack-slapped; past or future tense for slapping someone so hard they don't know jack diddley
1. What if I jack-slap him

2. He just got jack-slapped by his girlfriend dude

3. That boy is gonna get jack-slapped
by Dacatoa May 23, 2018
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To beat someone with your jimmy and bust a nut on their face
Get wise son before I hafta Jack Slap you!
by Dr Feelgood June 8, 2004
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WHEN YOU JACK OFF IN YOUR HAND, AND THEN SLAP SOMEONE IN THEIR FACE
CHICK PISSED ME OFF, SO I JACK SLAPPED THAT HO AND LEFT!
by BIZKITS February 28, 2009
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When you hit a guy in the private area with great force.
*guy gets a jack slap and falls on the floor in great pain*
by sabrina!! January 30, 2014
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To slap someone round the head for saying something in jack speak (naval language).
Sam says: "Can I go for a wash?"

LSA Swashbucket replies: "It's a dobey not a wash!"

SLAP!! Sam jack slap's LSA Swashbucket with force round the head.
by [FP]*PompeyPaul August 20, 2007
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