Kinfriend Share definition Flag A blood-relative that you are currently in a romantic affiliation with. Like if you are dating your brother or sister. "Oh? Timothy? He is my Kinfriend.""Oh? Samantha? She is my Kinfriend (or sisfriend)." Kinfriend by StyleSister15 June 27, 2024 0 0 Get merch Get the Kinfriend mug. Buy Now — $32.95 See more merch