Green’s Dictionary of Slang

soaked bum n.

(US short order) a portion of beets.

[US]I.L. Nascher Wretches of Povertyville 93: The diner gives his order to the waiter, who translates it into the expressive slang of the Bowery as he shouts into the kitchen, [...] ‘two shipwrecked’ for two fried eggs turned over, ‘soaked bums’ for beets, etc.