Ponce about
Definition 1 of 1
Pro Tip 1/3Cultural Imagenery
Originates from British slang meaning someone is behaving pretentiously or seeking attention, like in theatre. 
When she started to ponce about with her new designer bag, we all knew she was showing off.
Pro Tip 2/3Negative Undertone
Often used to criticize someone's behavior as unnecessarily flashy or attention-seeking. 
Stop poncing about with your new phone; we've all seen it!
Pro Tip 3/3Informal Use
Used in casual conversation, it is not suitable in formal or professional settings. 
I can't stand it when he starts poncing about in meetings trying to impress the boss.