DTR Share definition Flag Define The Relationship. When two people discuss their mutual understanding of a romantic relationship (casual dating, serious boyfriend, etc). Have you DTR'ed yet? I dunno what we are. I guess we gotta do a little DTR'ing tonight. DTR by Courtney Hodges March 9, 2003 0 0 Get merch Get the DTR mug. Buy Now — $32.95 See more merch