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A mental state indicating a period of intense revelry and hardcore drinking on the part of one or several people.
Jonno: “I’ma go into Birthday Mode this Saturday”
Blizzle: “Oh man, is this gonna end with neon-colored vomit all over your room…again??
Jonno: “Dude, that was Neil’s last Birthday Mode”
by blizzlinBR October 07, 2008
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