look up any word, like swag:

1 definition by Jonahk

 
1.
Verb: A slang spelling of the two words "Have to"

In genral, it used as a way of saying "Of course! Have to"
Person 1:Bro, are you coming out with the boys tonight ?
Person 2: Hafftoo!
Person 1: Sweet! thats us!
by Jonahk October 21, 2013