With no clear credited source, Kiss Cousins has circulated mainly as a short soundboard clip shared for its awkward humor. Its popularity online comes from how quickly it signals a cringe romantic twist without needing any setup or explanation. Creators reuse it across meme pages, short form videos and group chats whenever a family relationship joke needs a fast punchline. The short length makes it easy to loop, remix and pair with reaction faces, which has helped it stay useful as a reaction sound long after individual posts fade.