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Normally in a BDSM relationship.

A person, of either sex, who essentially "controls" the other people (as in plural, generally threesomes) in the relationship.

Is by far the most dominant, and strives to provide the most pleasure to people under him/her, most of the time without seeking retribution (without getting any pleasure back).

There can be a Dominant under his/her control, but they must still be pliant to the Controller's demands.
"She would be such a Controller, I mean, have you seen the way she behaves?"

"My Controller really did let us do some really naughty things last night."
by Whips&Chains December 11, 2016
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3
A device used to play video games, or a person in control of a machine, aka a train
Daniel: I ONLY DIED BECAUSE MY DAMN CONTROLLER BROKE!
Jack: You died because you suck.
Daniel: FUCK YOU.
by alee2006 June 26, 2018
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