A role played while having sex. Usually, the "overlord" is violent, dominating, dirty-talking, and on top. Men can usually play this role during sex, but women can, as well. Props used by the overlord include, but are not limited to: whips, handcuffs, rope, apples, leather accessories, dildos, etc..
husband: Hey babe, wanna have some sexual intercourse tonight?
wife: Sure, but I want to be the overlord this time.