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1. Everybody
All people whose existence the speaker deigns to acknowledge. Generally limited to those with similar interests and vocabulary.
Everybody knows that Super Metroid is the greatest game ever made. (everybody = video gamers who have played Super Metroid, whose favorite genre is the adventure-platformer)

Everybody lost money in the dotcom bust. (everybody = investors in the dotcom bubble)
2. everybody
a person who is versatile in various fields.
He is a composer, a singer, a musician, a painter, a dancer and what not. In fact, he is an everybody.
3. Everybody
Something that they sing on homestarrunner.com in the theme song.
Everybody! Everybody! Eveybody! La de do da do.
by Josh Aug 2, 2003 add a video
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