Green’s Dictionary of Slang

slabba-slabba adj.

also slabba, slabbah-slabbah
[dial. slabby, sloppy + redup.]

(W.I. Rasta) big and fat, slobby, droopy.

[WI]L.E. Adams Jam. Patois 62: Slabba-slabba: big and fat, slobby, droopy.
[WI]Francis-Jackson Official Dancehall Dict. 48: Slabbah-slabbah the state of being grossly overweight; a fat individual: u. a one slabbah-slabbah gal.
Jamaica Patwah 17 Apr. 🌐 slabba a fatr person. ‘i fridge empty kaaz slabba nyam all the food’.