look up any word, like blumpkin:
 
1.
*fatty watty DOES NOT mean fat*
its just a nice name for plenty of bad names u could call someone, like if ur someone who jus doesnt cuss, or maybe ur too lazy to think exactly of what bad name they are, or maybe there not really a bad bad name so u call them a fatty watty to be nice n funny about it
"
"You're a two-faced stuck up bitch whore" becomes "You're a fatty watty