People unfamiliar with the connotations of the missing 'T's (especially Southerners) will most likely take it as an incredible insult therefore it is only recommended for use between friends, either as a greeting or during a mild and friendly exchange of so called banter.
If intended for use as an insult, the 'T''s must be re-inserted and it will instantly revert back to its highly unpleasant original form.
(See also: The DafCun Scale)
"Har Har, shut up DafCun!"
"Lets have a dafty ya DafCun!"