A person who competes in Speech and Debate under the sub-category Expository Speaking. They are excellent speakers, wonderful visual aid creators, and generally amazing.
I went to a speech tournament and met the coolest exposer who gave a speech on Coolness.
If you've ever met an exposer you know they are kick-ass.
Combination of "exposure" and "disposal." Exposal is something that takes place when a person is exposed and embarrassed to the point where they leave and never return.