One very committed to a lifestyle of muscular development.
A bodybuilder, weightlifter, powerlifter, or other
individual who commits to a cycle of weight lifting, strict dietary regulation, and recovery - in the attempt of extreme "fitness," or at least maximum muscular size and symmetry.
A steroid-using individual.
A gym rat.
A guy (or gal) who juices ... or uses steroids, growth hormone, or any other combination of
testosterone boosters and supplements, herbals, and other chemical
derivatives to develop maximum physique.