Green’s Dictionary of Slang

upset v.

SE in slang uses

In phrases

upset someone’s lobster cart (v.)

(mainly US) to knock a person down.

[US]E. Mack Cat-fight 153: That big fish-eating lubber Carries too much bone and blubber, Ready up to take his part, I’d soon upset his lobster-cart; Make his bones ache, and blubber smart.
upset the shopping cart (v.)

(US campus) to vomit.

[UK]M. Belmonte Compter Science and Why (1993) 🌐 I was struck with [...] the plethora of words and phrases meaning ‘vomit’ and/or ‘to vomit’ [...] At most American colleges and universities, a weekend cannot pass without seeing multitudes [...] upset the shopping cart.