Green’s Dictionary of Slang

uproar n.

[a heavy pun]

an opera.

[UK]Farmer & Henley Sl. and Its Analogues.
[UK]P. Theroux Picture Palace 55: Papa loved music [...] he had a season ticket to the opera, though he called it ‘the uproar.’.

SE in slang uses

In phrases

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

to get excited, to become emotionally overwrought.

[US]K.C. Lamott Stockade 181: Why the hell is he getting his ass in an uproar about it?
[US]‘Curt Cannon’ ‘Now Die In It’ in I Like ’Em Tough (1958) 57: Don’t get it in an uproar, buster.
V. Lynne Journal 10 Dec. at [Internet] Do not get your ass in an uproar cuz you THINK I think this, or you THINK I think that.
get one’s bowels in an uproar (v.) (also ...balls..., ...pants...)

to become excited or agitated.

[US]E. Anderson Thieves Like Us (1999) 3: The Colonel’s bowels are gettin’ in an uproar now.
[US]B. Schulberg What Makes Sammy Run? (1992) 12: If he matters that little, why in hell are you getting your bowels in an uproar?
[US]W.P. McGivern Big Heat 104: Do-gooders, busybodies, their pants in an uproar about slums.
[UK](con. 1940s) D. MacCuish Do Not Go Gentle (1962) 256: Wages, stop gettin’ your bowels in an uproar.
[US]G.V. Higgins Rat on Fire (1982) 27: You come jumpin’ in now with your bowels in an uproar, the case is blown.
[US]N. Proffitt Gardens of Stone (1985) 281: Don’t get your balls in an uproar.
G. Fisher Gary in Your Pocket 56: Thomas was hollering across the room at the heavy-set man: ‘Look, don’t get your bowels in an uproar, old man.’.
R. Azar Homeless in Vegas 80: Hey, don’t get your bowels in an uproar. I’m just explaining the deals around here.