"dl-tranny" is a porn video tag that stands for "dickless transsexual." This refers to a pornographic video featuring a transsexual woman (often referred to as a "shemale" or "ts") who, despite being born male, has undergone surgical procedures to develop female-like secondary sexual characteristics. In this case, the term emphasizes that the transsexual individual does not possess a penis. These videos typically involve scenes where the trans woman engages in sexual activities with one or more male partners or may feature the trans woman pleasuring herself. The primary audience for these types of content are people who are specifically interested in trans women and their unique attributes.