Green’s Dictionary of Slang

cull n.2

[SE cull, to select weak animals for killing]

1. (US campus) a socially unacceptable person.

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[[US](con. 1861-5) B.I. Wiley Life of Johnny Reb 268: The Confederate surgical corps was made up wholly of ‘culls’ novices and quacks].
[US]G. Underwood ‘Razorback Sl.’ in AS L:1/2 57: cull n 1: Person considered socially unacceptable.

2. (US campus, spec. fraternity) anyone rejected for membership in a fraternity or sorority.

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[US]G. Underwood ‘Razorback Sl.’ in AS L:1/2 57: cull n [...] 2: Rushee rejected for membership by a fraternity or sorority.

3. (US prison) a physically weak convict.

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[US]C. Shafer ‘Catheads [...] and Cho-Cho Sticks’ in Abernethy Bounty of Texas (1990) 202: cull, n. – a convict given a soft job because he could not handle a hard job to which he was previously assigned.

In compounds

cull bird (n.)

(US campus) any woman considered socially or physically unacceptable.

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[US]G. Underwood ‘Razorback Sl.’ in AS L:1/2 57: cull bird n Female considered socially or physically unacceptable.