To cut someone off. To remove someone from your life simply because they are dead weight. Made famous by Nadia Aboulhosn.
Cassie: I can't believe George cheated on me.
Alia: Girl, you just need to dead 'em.
by Alia S. April 16, 2015
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to do amazing and make people super impressed >:3
"Knock em dead darling (・ω<)☆" Mettaton winked at Frisk.
by im_temmie September 24, 2019
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Johnny is nervous about his Recital.

"Knock em dead boy, you'll do great" his mom yelled from the car.
by Kotus April 29, 2011
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