To have ADHD, ADD or any other form of not being able to pay attention. Someone so distracted that the most random, unimportant thing could occur and they'd go AFK.
*Conversation happening*
"What do you think, Mark?"
*Silence*
Kane: Oh, he went brb jellyfish.
*Two hours later*
Mark: I'm back guise, I have cheesey chicken
"What do you think, Mark?"
*Silence*
Kane: Oh, he went brb jellyfish.
*Two hours later*
Mark: I'm back guise, I have cheesey chicken
by StephanieQ January 23, 2009
Get the brb jellyfishmug.