Green’s Dictionary of Slang

uproar n.

[a heavy pun]

[mid-18C–mid-19C] an opera.

SE in slang uses

In phrases

get one’s ass in an uproar (v.) (also get it in an uproar)

[1950s+] to get excited, to become emotionally overwrought.

get one’s bowels in an uproar (v.) (also ...balls..., ...pants...)

[20C+] to become excited or agitated.