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.