Green’s Dictionary of Slang

crunchie n.

[? mealie cruncher or f. krantzie, abbr. of krantz-athlete, milit. sl. for an Afrikaner; the term also reflects their overall image of violence]

1. (S.Afr.) a derog. term for an Afrikaner.

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[SA] informant in DSAE (1996).
D. Kramer in Frontline May 14: Call me a crunchie And I’ll take you outside I’ll show you just how the crunch is applied [DSAE].
[SA]R. Malan My Traitor’s Heart (1991) 54: The tyranny of the rockspiders, crunchies, hairybacks, ropes and bloody Dutchmen [...] Afrikaners.

2. attrib. use of sense 1.

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[SA]A. Lovejoy Acid Alex 195: Every one of your family is a filthy crunchie plank that fucks sheep and rapes pigs.

3. (N.Z. prison) a weakling who cannot withstand pressure.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 49/2: crunchie n. a person who folds under pressure.