We also maintain an assortment of words that I assumed were usual, until I used them outside the family, and then thought they were family terms, growing up in Oklahoma, with all our relatives in Kansas, but as an adult I have found them in OED as "archaic Scottish" terms. Go figure. (My father's mother's family was Scot and I assume they somehow held on.)
Grouse: to complain verbally; lower pitched than whining but tends to go on. (He keeps grousing about his taxes.)
Faunch: to express dissatisfaction physically as well as verbally; more than grousing, but short of tantrum; likely to involve eyerolling, headshaking, putting feet down harder than necessary, possibly door slamming. (He is faunching over the umpire's call.)
We also call portapotties "Donnikers" which I had understood is what carnival folk call them, but I recently heard a Scot friend refer to the "donnies" at a festival.