An internet term that is short for "in before" used when someone replies to something before something that they anticipate to happen eventually happens.
by OoftheDoof! July 19, 2021
Get the inb4 mug.
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
Get the inb4 mug.
You are calling something, you bet that it will happen.
inb4 a nerd said this to you
by Womaniser November 30, 2015
Get the INB4 mug.
a 4chan phrase that means "in thread before (b4) it 404's (gets deleted (you get a 404 error message when a thread is deleted))
"Anybody got some CP?"
"inb4 404"
by Vermin Supreme January 4, 2009
Get the inb4 404 mug.
Started on MLPForums, this refers to posting in a topic before ghostfacekiller39 that speaks badly of the character Rarity from My Little Pony: Friendship is Magic. ghostfacekiller39 is perhaps the most dedicated Rarity fan on the forums, and he's always quick to defend her when the need arises.
RarityHater69: "Rarity is the worst pony ever, she's such a bitch I hate her!"

GenericName123: "inb4 ghostie"

ghostfacekiller39: "(Long profound rant about why OP is wrong, with lots of Rarity smiley faces mixed in)"
by Frostgage March 6, 2014
Get the inb4 ghostie mug.