Someone of humble origins, new to the middle class who makes a big deal about food shopping at Waitrose or M&S. Such types will lose no opportunity to let you know where that "delightful couscous salad" came from and will frequently carry other items in a Waitrose/M&S bag to drive the point home. Normally the dregs of society who get their news from The Daily Mail, they will often scorn Aldi/Lidl shoppers and invite others to share their disgusting insecurity. Regard themselves as "posh", a word and a concept that is alien to anyone with breeding.
That Chavrose was around again this morning, banging on about who came to her dinner party.
Oh God, that awful Chavrose is coming over. I've never met anyone so common.
The one girl who you were stupid enough to let her get away, a decision that will haunt you for the rest of your life. She's smart, caring, fun-loving, and has got a booty that would make Buddah weep.