What does BRB mean?
I know that it's use at farewell, but how to decipher it?
Thank you in advance!

Question

Answer

Hello Olga:   BRB = an  abbreviation for Be Right Back,  usually.

---Warm Regards, Bruce

Answer

BRB means:

either Be right back or
Bathroom break.
>Usually be right back.  It's mostly used in chatting - through the internet, etc.

Hope this helps!

Answer

Be Right Back=BRB...  meaning I will be back in under 3 minutes, something has come up, and
I must attend to it, but I will be with you shortly....  I will be right back....8]