1. Nickname given to a tall person.
2. Nickname given to a person with a penis over the size of 9" when erect.
3. The process of being given a blowjob while under the influence of cannabis.
1. Tall boy john is 6 ft 10!
2. They don't call him Tall Boy for nuting, you seen the size of his schlong?
3. I had a great Tall boy last nite.