(AU) Any of various small species of ant of the genus , often capable of jumping and having a painful sting.
(AU) Any of various small species of ant of the genus , often capable of jumping and having a painful sting.
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(Australia) Of a horse, to jump upwards with arched back and head down in an attempt to throw its rider.
(prison slang) A sex offender.
(AU) The action (of a horse) of aggressively attempting to buck a rider.
(Australia) To take part in a competition where riders attempt to stay on a horse that jumps in this way.
Tree jumper is prison slang for a sex offender — specifically the kind who commits offenses outdoors or ambushes victims. In prison culture, sex offenders occupy the lowest rung of the informal hierarchy and face severe social consequences from other inmates. Terms like tree jumper are part of a broader vocabulary of dehumanizing insults used in that environment. It's not a neutral descriptor — it's a contemptuous label. Worth knowing if you're reading crime fiction, watching prison dramas, or researching carceral culture.