Green’s Dictionary of Slang

sauce n.2

[fig. use of SE, but why?]

(US campus) something bad or inferior.

[US]College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Sauce 1. (noun) Something bad, or low-rated.

In derivatives

In phrases

drink of sauce’s cup (v.)

see under drink v.