The commonly used term for illegally organised raves, usually held in some skanky derelict building/warehouse (but can be outside too) and located by calling a given mobile number after a specified time on the night of the party. Normally has a start time but no end time as it generally goes on until the police get wind and shut it down! Usually a VERY messy affair involving a blend of acid techno/psytrance copious amounts of hedge monkeys and a side order of random chavs.
"I went to an amaaazing free party in that office block last night! Everyone was lovin it til the rozzers shut it down!!"
by carlypussycat March 13, 2008
the more commonly used term rather than illegal raves designed for crustys, and ravers and the odd group of teenagers fun filled and all peace and love no bad vibes
by mewtzolot123 February 19, 2023