Green’s Dictionary of Slang

snitch n.2

also snitcher
[ety. unknown; ? link to snit n.1 (1)]

(N.Z.) a grudge; hostility, bad feeling.

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implied in get a snitch on
[NZ]McGill Dict. of Kiwi Sl. 105/2: snitch on feeling of ill will.
V.G. O’Sullivan Let the River Stand 42: She was blowed if she’d go along with her husband [...], getting a proper snitcher like that from someone else’s report [DNZE].
[NZ]McGill Reed Dict. of N.Z. Sl. [as cit. 1988].

In phrases

get a snitch on (v.) (also get a snitcher on, have a snitch/snitcher on, take a snitcher on)

to bear a grudge towards, to take offence (at).

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[NZ]N.Z. Truth 24 Aug. 8/2: The half [i.e. a rugby player] had a snitcher on the Man in the Moon. and every time the ball came out to him he tried to knock his enemy off his perch.
[NZ]N.Z. Eve. Post 14 Mar. 8/8: This Pete the Painter’s got a snitcher on me.
[US]J.A.W. Bennett ‘Eng. as it is Spoken in N.Z.’ in AS XVIII:2 Apr. 90: A person complaining of another’s ill-will might also say, ‘He’s got a proper snitch on me’ – obviously a variant of ‘to snitch upon’ (to inform against).
[NZ]Landfall 6 June 109: These jokers didn’t understand the snitch Myers had on you [DNZE].
Here and Now Apr. 35: Sirs: Your ‘Housewife’ has apparently taken a ‘snitcher’ on us schoolteachers [DNZE].
[NZ]G. Slatter Gun in My Hand 91: Got a snitch on me and put me in crook with the boss.
M. Davis Watersiders 49: Most times he lets us get away with it. But if he gets a snitcher on [...] all we’ll collect is the thick edge of his tongue [DNZE].
N.Z. Short Stories (1976) 128: He wasn’t a man to get a snitch on his neighbours because of a bit of bad luck.
[NZ]G. Slatter Pagan Game (1969) 164: The selector had a snitch on me.
F. Sargeson Sunset Village 29: It was Brixton’s habit, this talking to himself, a long monologue which reproduced the slang of forty years ago. Sometimes [...] he might tell about some bloke he had a snitcher on.
E.T. Beardsley Blackball 08 38: But listen, Paddy, don’t call my wife ‘missus’. She’ll take a snitcher to you straight away if you do. [Ibid.] 111: The missus had got a real snitcher on the place [DNZE].
P. Grace Baby No-Eyes 46: Anyway, you don’t have to have a snitcher on them just because Shane was a nutter.
C. Sherborne Muck 31: Does he have a snitcher on you, do you think?