It doesn't stand for anything. A slab is a synonym for slut. Reffering to always being on her back like a slab of wood or cement. Popular among the urban population but slowly making its way around.
Did you hear about what stephanie did last night? She gave a birthday blowjob to a random guy then went and fucked her boyfriend. What a slab!
by Slabbyslab August 2, 2011
Get the Slabmug. Noun
A term of endearment used by certain north New Jerseyites where the counties Morris, Somerset, and Union meet. Used to suggest a friend is massively lazy and unproductive, yet still a homie.
Also: Slabby (Adj.), Slabbyness (N.), Slabification (N.), Slabbify (Verb)
A term of endearment used by certain north New Jerseyites where the counties Morris, Somerset, and Union meet. Used to suggest a friend is massively lazy and unproductive, yet still a homie.
Also: Slabby (Adj.), Slabbyness (N.), Slabification (N.), Slabbify (Verb)
"What up, Slab?"
"That kid is such a slab its unreal, although he is getting his meat game daily at the gym down by rt. 22"
"You are the slabbiest slab I have ever had the pleasure to do nothing with."
"That kid is such a slab its unreal, although he is getting his meat game daily at the gym down by rt. 22"
"You are the slabbiest slab I have ever had the pleasure to do nothing with."
by Yahee Brosef February 11, 2014
Get the Slabmug. by p3anut August 5, 2008
Get the slabmug. 
Down south we ride slabs
by J-HTX July 14, 2007
Get the slabsmug. by The Krunk Wizard Giz August 9, 2006
Get the slabmug.