Form of endearment used by the NZDF land forces. Initally confusing as it creates a feeling of disatisfaction but eventually you grow to realise it secretly means they care.
Where the fuck are you going ball bag?! Get that fuckingtarget up!
In addition to its use to designate the scrotum and its contents, BALL BAG can also refer to a weighted leather pouch that encloses the scrotum and testicles and distends them. The weights involved can be up to several pounds. Predominately gay S/M use in this sense.
Bob was punished by having twolbs added to the ball-bag he was forced to wear during the S/M session.