cat
A passive homosexual, applied to young (and usually otherwise heterosexual) prisoners who submit to this role while in prison (1950s)
hock
A prisoner who takes the active or ‘insertor’ role in homosexual relations (1940s) This role does not necessarily indicate that the person adopting it is perceived as, or actually is, a homosexual.
lunar
One-month sentence. Also Moon. A three-moon is three months, a six-moon or sixer is six.
chocolate frog
Rhyming slang for 'dog' (informer). Short version chocolate (1970s).
peter
Cell (1800s). Originated from the old slang ‘peter’, for portmanteau (a trunk or a box), the term was applied to the box-like qualities of a cell) A black peter was a punishment cell, usually a very dark one. Associated peters were cells with at least two prisoners in them. A peter thief is a prisoner who steals from others’ cells. ‘Peter’ was recorded at Boggo Road in 1907.
flea
(1940s) A prisoner who seeks to be on good terms with warders and prisoners (i.e. he hops from one to the other, like a flea).
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