Stands for "in before". You or whoever is saying it is "in" before something happens. For example, if your on a message board, you are "in" it so when you say inb4 you mean to say, "I'm in before... such and such happens!". Usually used to predict an unfortunate event similar to the PepeLaugh emote.
by standproudsukunayouarestrong February 23, 2024