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Generally used on internet forums, inb4 refers to a user posting a reply to a message/topic "before" another user posts an obvious response. When used appropriately, inb4 is followed by a word or short phrase that the user knows will eventually appear in the topic conversation.
Jonny113: Jiraiya would beat the crap out of Itachi.

Steven387: inb4MS

Mike128: You know Itachi has MS, so Jiraiya doesn't stand a chance.
by CM Joker January 17, 2009
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May 12 Word of the Day
When someone goes to the gym and spends 90% of the time on their phones scrolling through social media
Looks like its thumb day again for Jimmy with his usual routing... 3 sets of 5 snapchat selfies and 10 sets of scrolling through facebook until exhaustion
by Gary br April 02, 2017
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2
An abbreviation used on messageboards like /b/ in anticipation of a certain image, event, or meme occuring.
"In b4 Togepi" = I am sure that any second now, a picture of Togepi will be posted to this thread.

"In b4 b&" = There is no doubt that someone is about to get the banhammer because of their churlish behavior.

"In b4 v&" = I am quite certain that the FBI will soon be showing up to take us all for a ride in the party van, and if such a thing happens, you can't say I didn't see it coming.
by Frederico Lo Cunto April 30, 2007
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3
You are calling something, you bet that it will happen.
inb4 a nerd said this to you
by Womaniser November 30, 2015
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4
a short for "in before" . Term used in forums around the internet such as 4chan
in b4 mods ban us
by Them4n3r January 17, 2015
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