LNT (Late Night Tip) Share definition Flag A girl that you can call at the end of a late night that you will guaranteed be able to have sex with. It's 3 AM and I'm horny, I better call Nicole my LNT (Late Night Tip). LNT (Late Night Tip) by Jordo467 September 29, 2009 0 0 Get merch Get the LNT (Late Night Tip) mug. Buy Now — $32.95 See more merch