NHTB Share definition Flag Never Heart That Before - used when someone says a 3 or 4 letter abbreviation to you that they probably just made up on the spot. "Thanks Becky, LYMI" "NHTB!" NHTB by IDTMI February 3, 2014 0 0 Get merch Get the NHTB mug. Buy Now — $32.95 See more merch