Green’s Dictionary of Slang

stir n.2

[SE stir, movement]

1. a crowd.

[UK]Farmer & Henley Sl. and Its Analogues.

2. (Ulster) a plan, a scheme.

[UK]P. Kavanagh Tarry Flynn (1965) 144: ‘I was talking to May Callan last night.’ ‘I see,’ said Eusebius as if he had heard something very special. ‘Had she any stir?’.

3. (orig. Ulster) fun, enjoyment, a party.

[Ire]C.I. Macafee Concise Ulster Dict.
[NZ]McGill Reed Dict. of N.Z. Sl.

4. (N.Z.) a bout of troublemaking.

[NZ]H. Beaton Outside In I i: The screws are gettin’ jumpy! We don’t want no more stirs.
[NZ]McGill Reed Dict. of N.Z. Sl. 200: stir 1. Trouble, or the act of encouraging or stirring up trouble.