O2

When you can't live without someone, you call them O2 because you can't live without them (like you can't live without oxygen).

"Ugh I like him so much, he is so O2"

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CN

CN - used to describe someones hotness as deadly, referring to the deadly chemical compound cyanide.

"OMG he is sooooo CN"
"Dude, that girl over there is CN as f*ck"

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