When I was a kid, my parents used the word "gunch" as a verb meaning "to complain bitterly". They basically used it as an alternative to the word "bitch". I was wondering, earlier today, if it was a real word or not. Googling it, I came up with an Urban Dictionary entry that claimed that it was a particularly foul slang term for "vagina.", and a claim that it was a term coined by some MIT model train club in the late 50s or early 60s, which used the term to mean "to push, prod, or poke at a device that has almost (but not quite) produced the desired result".
Does the word exist in the OED? If so, what defintion is given for it? Was my parents use of the term unique to our family?