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BRB is short for "be right back", which means quite literally that a player will be unavailable for a short period of time (e.g. 30 seconds) but they will "be right back". For example, if a player is leaving their computer to get a drink, they might use this phrase to let you know that they will be gone.
"I am going to get some lemonade, I'll BRB!"
"BRB, I need to speak to my friend."