25l Share definition Flag 25L is slang for 25 to lifewhich of course is a jail sentance in which one is imprisoned for 25 years-to the rest of their life. I knew I shouldn't have killed that guy, now im locked up for 25L! 25l by Shu February 25, 2005 0 0 Get merch Get the 25l mug. Buy Now — $32.95 See more merch
