1. noun: having a large diameter penis. The white mans answer to the long skinny black penis. The whiteside is usually muscular in appearance and can be compared to a pringles can.
2. adjetive: a slang term most often associated with a penis of large girth; capable of increasing vaginal circumference
see also: pringle can, coke can, stalky stub muscle, Matthew's holy hammer
2. Matthew has a thick bulge in his pants. He must have a whiteside penis.
Kid 2: Yuck. I always thought Mick was a bit wierd.