BRB — "be right back" (usually used in chats and on an instant messenger service).

What does BRB mean from a girl?

BRB in Snapchat text slang means "Be Right Back." This slang is generally used to indicate that a person is going offline for a short duration of time. It also conveys that the person will text once they come back online.

What does BRB mean in a relationship?

BRB. Meaning: Be right back. If you are having a conversation with someone and have to step outside to pee or poop or to carry on a chore, the polite ones use this.