DTLB Share definition Flag A variation of DTF(Down to fuck), DTLB meaning Down To Lick Butthole. One can pretty much assume the rest. -"Dude is that girl DTF?" -"Naww, she's DTLB, she's a fuckin' frrreak!!" -"Shit!" DTLB by Collin Charisma January 7, 2009 Get the DTLB mug.