Well as a stoner even with randoms its still normal for them to say that. They want attention if they are one of those -blam!- who go "BRO, ima go smoke some of this super mega ulta blazatron 9001 mlg 420kush real quick...brb" people get up and say "brb im going to..." all the time...just because this isnt something normal that you do it means they are seeking attention cause they politely tell you they will brb and you can hear them hitting the bong?