Festivals, Carnivals, & live gigs are usually them main culprits
'Get the tube man, its gonna be a ROADBLOCK!'
'Dr. Dre doing a live free set in the ASDA carpark, get down there early, its gonna be a ROADBLOCK!'
her from behind, you got her mouth. Selfishly he shoots his load in her,
thus preventing you from using that road later.
I heard these horrible wet retching fallowed by gagging sounds the other day but it turned out to be someone getting roadblocked.
Steven: Hey Andrew. Want to get roadblocked again?
Steven: Say "Ahhhhh."