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.
When 2 or more cats run down a flight of stairs, causing a rumbling sound and knocking over everything in their path. This often due to excitement and/or food.