sleeper hit 

Generally any type of media that is marketed as under the radar, yet is of quality to have been a top tier marketing tool.

"That game is definately a sleeper hit, easily worth my twenty dollars!"

sleeper hit by Senior Twinkles May 28, 2006

Sleeper hit 

A type of media that found success years/months/weeks/days after its release.

Duncan Laurence’s Arcade, which is a song, is an example of a sleeper hit. It represented the Netherlands (and also their winning song) at the 2019 Eurovision Song Contest and later went viral on TikTok in 2021.

Sleeper hit by thecharacterwannie September 28, 2022

Sleeper Hit 

Someone who you personally find attractive (real or a fictional character), but most people don’t or at least don’t talk about how they’re attractive.

“You know Ushijima? Yeah, he’s a sleeper hit.”

Sleeper Hit by I_just_wanted_to_add_one_thing May 28, 2024