Random Boner Attack: when one randomly gets a boner.
RBA's often come about while riding in the back seat of a car or in class. When someone goes to get up to do something and they have a visible bulge or are pitching a tent
An acronym for Random Ball Ache, literally from nowhere pain is felt in the genitalia (male) area, this often leads to the necessity of a reshuffle or rearrangement of the aforementioned testicles to relieve the pressure.