Green’s Dictionary of Slang

1. fat.

1819

‘One of the Fancy’ Tom Crib’s Memorial to Congress 14: For they saw, not withstanding CRIB’S honest endeavour / To train down the crummy, ’twas monstrous as ever!

2. the stomach.

1822

‘A Modern Mill’ in Egan Anecdotes of the Turf, the Chase etc. (1827) 221: He at last was so punished, and queered in the crummy.