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A phrase commonly used in heavly moderated chat rooms to say "kill yourself". Stop breathing is thought of as a nicer way to tell people to leave someone to remove themseleves from existence, less likely resulting in a ban from moderators due to it's vague nature.
Girl 1: Did you hear, Karen is still going around school talking of how you sleep with any thing that has legs? She's posting it all over FB.

Girl 2: SMH, Karen needs to stop breathing asap.
by 2stepsAhead June 01, 2018
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