A penis, specifically a bulbous or "chode" like member. Less of a "shlong" more of a "wang".
"Slap a fat one in your mouth and STFU"
by Colly February 22, 2005
A person who is fat. Combines the words fat and one, and is pronounced like the name of the former NSync singer Joey "Fatone"
Wow, that new girl in the department sure is a fatone.
by Vinbob September 29, 2006