Lactosnot Share definition Flag The milk that comes out of your nose after laughing really,really hard. (After taking a drink of milk) She blew out some serious lactosnot the other day and got it all over her shirt. Lactosnot by Jed Spears January 17, 2009 0 0 Get merch Get the Lactosnot mug. Buy Now — $32.95 See more merch