The immediate period after Townie pubs and clubs kick out at the Weekend when hundreds of chavs fall out of the establishment to fight, copulate and inbreed.
Police officer 1: Well Lenny I think we're going to have a right chavalanche on our hands tonight when Evolution kicks out!
Police officer 2: Lets hope so Dave I cant wait to take out a few of those grubby little Pikey Fuckers.
Combining the words Chav and propagator. Description of white stretched limo full of young chav kids hanging out of the rear windows as it cruises around town centres.