adjective : describing someone so oddly attractive to you, you are unable to delete them from your Facebook no matter how offensive or boring they may be, you find them irresistible
or they are just so awesome you can not imagine your Facebook life without them, either way they are undeleteable!

That girl is so annoying yet ,I find her undeleteable. Its like I have to know what stupid thing she will say next!

undeleteable by Dawnels June 30, 2010

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undetectable equals untransmittable

The USA's national health protection agency, known as the Centers for Disease Control and Prevention on September 27, 2017, officially released the historic report stating "When ART results in viral suppression, defined as less than 200 copies/ml or undetectable levels, it prevents sexual HIV transmission." -Eugene McCray, MD CDC

This news is the motivator for the now commonly used term, Undetectable Equals Untransmittable.

So undetectable equals untransmittable means that if your HIV viral count is undetectable, then essentially you're not a risk to pass the infection to another.

undetectable equals untransmittable by RobbiRacks.com October 28, 2017

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unyeetable

when a being or person is too powerful to be yeeted

ex: Bro Mothman is ripped. he’s unyeetable dude.

unyeetable by mothman #1 stan November 15, 2018

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