A term derived from the westernized definition of otaku combined with the name of fictional Suicide Squad and Birds of Prey character Harley Quinn. OtakQuin is singular and plural and describes anyone with an unhealthy (usually sexual) obsession with the Suicide Squad/Birds of Prey version of Harley Quinn as well as any woman that dresses up as Harley Quinn more than 120 days of a calendar year.
Person 1: Why are so many girls dressed up as Harley Quinn this Halloween?

Person 2: Because they want attention from all of the boys that are obsessed with Harley Quinn ever since Suicide Squad came out, damn OtakQuin.....
by @Console_Harmony October 30, 2020