The phrase a dime piece builds on the ten point rating scale, with a dime worth ten cents standing in for a perfect ten. It circulated first as everyday slang for a very attractive person, then moved into hip hop lyrics, social posts and short form video captions. As soundboards and meme editing grew, the spoken phrase was clipped on its own so creators could drop the rating into a scene without typing it. It stays popular because the meaning is instant, even without any context around it.