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430, on the gulf coast, does refer to marijuana lingo. but, we use it as meaning that its over.
Tim: It's fo' thirty(430) for that mother fucker, he done fucked up.
Jon: Yeah, fo' thirty bitch.
by FuckinDubbin December 31, 2005
4-30 means that something is over/finished/complete.
Man, when I get the new Jordan's it's gonna be 4-30!
by Nakarrie Thompson May 22, 2008