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.
Once word got around that he was a tree jumper, protective custody was his only option on the wing.
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(prison slang) A sex offender.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.