Define No You Meaning

the bestest comeback ever. if you're getting roasted, you can just say " no you" and you automatically win.

Possibly the greatest comeback ever devised. Although it seems childish it was originally used to almost parody the usual immature responses in mature arguements with immature people.
It was brought to popular use from the popular Machinima, Masterchief Sucks At Halo 3/Arby and the Chief

A retort to "you are", the the mid-level retaliatory responce.

nobody never knows you that way

sitting on heirlooms from far away
a dress that was sewn for motherly lives
moths have now eaten its pearly waste
nobody never knows you that way

falling in love is like falling in line
you think what you get back will ease the pain
a strange deal, unspoken, faces entwined
nobody never knows you that way

theres blood and monsters you've taught to hide
and if you behave they wont reappear
yearning for a fleshy way to speak
nobody never knows you that way

the moons and the suns have multiplied
you hear my plea "i'm safe now, i can"
so what keeps you from proving me wrong
"nobody never knows you that way"

Dublin method of adding a rogue 'you' at the end of an insult or statement, derives from Irish (Gaelic) method of putting second person singular after a verb. can be used with any insult but sounds funniest with ones which already end with 'you'. The second 'you' is usually drawn out a little longer.

A rhetorical question asked, usually on social media, to embarrass them with any online content from their past if they ever contradict themselves or have a very unpopular opinion.

The only one that can prevent wildfires.

The thing i want to be mine.

The stage in a relationship before "I love you" and after "I like you"