Green’s Dictionary of Slang

Illegal Tegal n.

[the NZ chicken-producing company Tegal, thus pun on chicken n. (4d)]

(N.Z. gay) an underage male prostitute.

[NZ]W. Ings ‘Trolling the Beat to Working the Soob’ in Int’l Jrnl Lexicog. 23:1 71: In New Zealand there have been many terms for a young male street worker [...] Illegal Tegel. Tegel™ is a company that provides dressed poultry in New Zealand. The expression interfaces with the broader metaphor of the chicken.