(music) A bass guitar technique of hitting a string hard with the side of the thumb knuckle, producing a loud but brief snapping sound. Slapping is usually combined with popping, the act of pulling a string outward with the finger tip and letting it snap back. Invented by Larry Graham (Sly and the Family Stone, Graham Central Station).

Slap & pop bass sounds are very characteristic of disco and funk music, though around 1990 it got very popular again when bands like Red Hot Chilli Peppers, Primus, Infectious Grooves, and Faith No More hit the hard rock radio stations and Mtv.
Jazz players on upright bass (aka double bass) have a technique called "slapping", but it's a completely different technique that involves literally slapping the strings.
by Bill M. August 27, 2004

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An expression of excitement when the hand is not available. A High-five to the face.

"I did not slap you, I simply high-fived your face"
by Auja11 January 16, 2009

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stands for Sounds Like A Plan.
Person 1: "let's go to the park."

Person 2: "SLAP"
by Playlist February 02, 2012

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Sounds Like A Plan
SK: You wanna do hookah this weekend ?
Me: Sure, you wanna invite *** and *** too ?
SK: yeah, I'll let them know ... meet at 8 ?

Me: SLAP !
by SLAP-PER ! June 09, 2011

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an acronym for "sounds like a plan".
unrelated to the action of slapping someone; can be distinguished based on context.
A: So, I'll meet you tomorrow at 8:00?
B: Slap!
by strawberry21 December 28, 2009

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Synonym for make up
Got to put me slap on.
by kim evans August 21, 2009

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Sounds Like a Plan!
Joe: Wanna go grab a drink?

Schmoe: SLAP!
by radprof May 14, 2014

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Acronym for: Sounds Like A Plan!
Celia: Do you want to get sushi for lunch?
Amelia: SLAP!
by Jada is my name May 07, 2010

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