Green’s Dictionary of Slang

chinch n.1

[Sp. chinche, a bedbug]

1. [mid-19C–1950s] (also chink) a bedbug; thus chinchy adj., infested with bugs.

2. [1960s] a term of affection, usu. aimed at a child.

In compounds

chinch pad (n.) [pad n.2 (2)]

[1940s–50s] (US black tramp) a very low standard of rooming house or hotel.