I discuss flanges a lot at work and on the phone....my missus all ways goes red and laughs. I never heard of this word misused until I was an adult. We had other words...Perhaps its why I always laugh at @Ducbird discussing her "mini"
I work at an engineering design consultancy in the IT department - I hear the word "buttstrap" thrown around a lot....been here 14 years and still no idea what any of them do...