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1. To blow vastly out of proportion. To exaggerate or stretch the truth so far that you are basically a straight up liar. 2. To lie. Usually not used as a verb but as a interjection. It is mostly used to call someone else out on what you believe to be a lie. The proper way to call boost is to get as close to the liar's face as possible without touching them and scream BOOST. Similar to Bull Shit, but different.
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