Source : Webster's Revised Unabridged Dictionary (1913)

Slabbing \Slab"bing\, a. [See 1st {Slab}.]
   Adapted for forming slabs, or for dressing flat surfaces.

   {Slabbing machine}, a milling machine.

Source : WordNet®

slab
     n : block consisting of a thick piece of something
     [also: {slabbing}, {slabbed}]

slabbing
     See {slab}