slang A party where the primary activity is smoking marijuana. Can't you smell that? I think they're having a grass party next door!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a marijuana-smoking party. (Drugs.) The goon squad raided Pete’s grass party without any warning.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.