(n.) an individual, usually male, who is prone to becoming erect (or "busting a chubby") in the presence of a large group of people.
The other night at The Arch, Sting started to get aroused and Grizz acused him of being the chubmaster, much to Sting's disgust.
by GrisolMtish January 20, 2006
Get the chubmastermug.