430 Share definition Flag 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. 430 by FuckinDubbin December 31, 2005 0 0 Get merch Get the 430 mug. Buy Now — $32.95 See more merch