boulevardier
To strut or show off like a boulevardier.
intransitive
One spectacular being clothed liked a boulevardiering cavalier and having the mein of a finished chesterfieldian gentleman was noted seated in an oak near the cabin one day. ... It was a northern butcher-bird, the aggressive shrike ....
Where it comes from
Borrowed from French boulevardier, from boulevard + -ier.
Adapted from the Wiktionary entry boulevardier (CC BY-SA 4.0).