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the word "Balls" (implying testicles) Spelled Backwards. It seems to have varied usage.

In the way I learned it, Often followed by an argument between the two parties at hand. (See example)
Person A: Hey Guess what?

Person B: What?

Person A: Sllab! (NOTE: PERSON B MUST SAY "WHAT" IN ORDER FOR PERSON A TO RELPY "SLLAB")
This argument often follows for those "in the know":

Person B: Dickbag/Stickbag (depending on whether person B is in JHS Percussion or not)

Person A: Down your throat

Person B: Hope You choke

A variant has Person A replying to "what" with "Sllab Dickbag," creating a role reversal and ends wit person A winning the "Argument"
Related Words
The same thing as balls but reverse. Mainly used by internet folk.
"haha, man I'm just busting your sllab
sllab by Desmondj September 26, 2006
"Balls" Backwards. Used to trick people who don't know what it means. waverly jumbles
Brett: Hey Mr. Geist, is today a sllab day?

Mr. Geist: Ya today is a lab day.

Matt: I have this huge foam sllab in my basement that I could use for my project

Mr. Geist: Ya, that would be a great idea.

Brett: Hey Mr. Geist, isn't there a huge concrete sllab under the carpet?

Mr. Geist: Ya we could bounce the golf balls off the slab under the carpet.
sllab by SLLABINATOR November 11, 2008

sllab amogus

Person 1: sllab amogus
Person 2: what?
Person 1: say it backwards
Person 2: Oh....
Person 1: SUGOMA BALLS

#sllab sllab

The definition of #sllab sllab is basically the definition of sllab (hitting a male in the balls and shouting out sllab) (it originally came from the word balls backwards).
I just hit my friend in the balls and shouted out "sllab!" So #sllab sllab!
#sllab sllab by Stanford!! May 30, 2018

Pyro-noxious Slabs 

A hazardous, geologic event wherein a hyper-accelerating flow of highly concentrated, sulfur infused volcanic magma builds, cools and intermittently cracks, avulsing into jaggedly uniform, mobilzed 'slabs' of densely toxic rock formations. In rare and unique environmental conditions, migratory slabs have been observed to spontaneously combust into abounding flames upon impact with proximate flora, fauna and curious homosapien onlookers, resulting in a enveloping expulsion of sulfuric cinder chards and respiratory impairing, noxious fumes.
1. "Did you see how the lava formed into 'Pyro-noxious Slabs' when it came down the side of of the volcano, cooling in rhythmic waves as it hit the ocean water's edge?"

2. "I still can't believe that Drew was instantaneously incinerated into a sulfuric plume of ash when that 'Pyro-noxious Slab' chased after him while he was trying to take pictures!"