noun

• (Australia) A carton containing 24 cans (chiefly of beer).
  "The Australians murder a few slabs of beer and the New Zealanders murder a few vowels."
• (nautical) The slack part of a sail.
• (surfing) A very large wave.
  "After being towed into a massive slab, Dorian dropped down the face and caught a rail, putting him in a near-impossible situation."
• (programming) The amount by which a cache can grow or shrink, used in memory allocation.

verb

• (transitive) To make into a slab.
• (transitive, informal) To destroy (a structure) so completely as to leave only the foundation slab visible.
  "Multiple homes were slabbed by the monster tornado."

noun

• (archaic) Mud, sludge, or other viscous matter.
  "Some do also plant oziers in their eights, like quick-sets, thick, and (near the water) keep them not more than half a foot above ground; but then they must be diligently cleansed from moss, slab, and ouze, and frequently prun'd (especially the smaller spires) to form single shoots;[…]."

adj

• (archaic) Thick; viscous.
  "Make the gruel thick and slab:"