Shag Busting 

To creep up on unsuspecting couples (or threesomes for that matter) who are in their cars late at night, usually in a deserted (or so they thought) car park and bang on the windows thereby ruining any moments of sexual gratification.

After the pub shut we went to the car park and did a bit of shag busting...

Shag Busting by Main Onion October 18, 2006