Public display of affection 

Couples operate in public areas, and they display affection such as holding hands, kissing etc. They do this to rub it in single people's faces that they don't have a boyfriend/girlfriend.

'Woh. There's some serious PDA goin on here. I wish they'd bugger off, they're makin me depressed.'

Public display of affection by Mary November 25, 2003

public displays of affection

Romantic body language and/or
passionate physical interaction between lovers in full public view. When over-used or too graphic, can be indicative of an insecure couple in an unstable relationship. PDA exhibitionism is used by many couples to prove their love to onlookers, and to elicit envy.

"Look at those two douchebags and their tacky public displays of affection, playing tonsil hockey over there like a couple of ferrets in heat. Get a room!

public displays of affection by cocoa puffz July 30, 2008