The alpha and the omega of all internet comebacks. This phrase stands alone as the only statement powerful enough to truly reverse a dreaded "no u" comeback. This is considered the ultimate and final demise to any argument, as it leaves the recipient utterly defenseless and incapable of countering.
An often overlooked aspect of this potent phrase is the way in which it subtly manages to transcend the common rules of language and grammar to mean "That's Not You, It's Me" AND "That's Not Me" simultaneously. This unparalleled versatility enables it to reflect all the negative aspects of an argument onto the victim whilst projecting only positivity upon those who wield it.
Matt: "You suck. Go commit bathtub toaster!"
Steven: "No u"
Matt: "No u"
Steven: "Hah, nice comeback you turbo virgin! I'm the best."
Matt: "No me"
*Steven begins pouring himself a Toaster Bath*