An illegal organized gathering, frequently in a warehouse, field, etc., at which Acid House music is played, and hallucinogenic drugs are often reputedly available.
Origin
1980s; earliest use found in The Guardian.
Definition of acid house party in US English:
acid house party
noun
An illegal organized gathering, frequently in a warehouse, field, etc., at which Acid House music is played, and hallucinogenic drugs are often reputedly available.