Jargon watch: "book" as a synonym for "cool". Sample usage: "That YouTube video is so book." As books are decidedly uncool, you might wonder how this usage came about. Book is a T9onym of cool...both words require pressing 2665 on the keypad of a mobile phone but book comes up before cool in the T9 dictionary, leading to inadvertent uses of the former for the latter. (thx, david)
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