A coloquial abbreviation of "As if I care", or "as if you care". Used to
express disbeleif at
the other's lack of consideration, or to
express a lack of consideration of the other's predicament.
"i promise never to do it again"
"zif-i, you can do what you want, i
don't care anymore"
"I hope you do well in your exam tomorrow"
"zif-u - you were totally against me going back to college"
"Hey how're you doing mate?"
"zif-u, you're full of
shit"
"I've been getting these headaches every
time you play your heavy metal music"
"zif-I, you
don't think about me when you mow the lawn at 8am!"
or
"zif-U, you greasy haired mother"