X-Pac Heat is not what is given off when you burn Sean Waltman to a crisp, though it does describe the feeling of wanting to burn Sean Waltman to a crisp.
The Xylophone Gag is an old cartoon gag, but it's not the one where a character rams into a piano or xylophone head-first, and, upon looking up, has the instrument's keys sticking out of their mouth as a sort of prop-induced Wild Take of pain.
YKTTW is not a rival site to YTMND.com. You might be looking for PTKFGS instead.
Yoko Oh No is not the sound you make when Yoko from Tengen Toppa Gurren Lagannkisses someone, and the recipient dies a very, very manly death at episode's climax.
It's also not a Stock Phrase a frustrated Mr. Exposition yells at the rest of the cast when he's tired of pointing out things that should be common knowledge.
A Zerg Rush has nothing to do with the tactics of the woman who broke Ken Jennings' win streak on Jeopardy!.
Zero-G Spot is not a woman lacking one. Nor is it proof that a particular Mega Man X character is actually a girl.
The Zeroth Law is not "protecting humanity as a whole trumps obeying the Three Laws of Robotics". Conversely, a Zeroth Law Rebellion does not involve going back in time and writing something that becomes the Trope Codifier for a trope Shakespeare currently codified.