poplolly
A man's mistress, or a single woman of loose morals; a sweetheart.
obsolete
This house presided over by a poplolly! a magnificent woman, dressed to perfection, without a vestige of her former habits.
Where it comes from
Likely a fanciful variant of poplet, ultimately from French poupe (“doll”).
Adapted from the Wiktionary entry poplolly (CC BY-SA 4.0).