inEFFable

Which one is it;

1. Sumthing too indescribable without the F word and it's derivatives
   
2. Ones who are UnFUCKable, or at least they think so until proven otherwise
   
3. An alternative to the expression 'I don't give a damn FUCK about you and other whatfucks'
   
4. Literally means 'What The Eff?"
5. If its on a Black T-Shirt worn by a teenage samseng kampung dusun it means 'Ntah? Dunno what it means but it looks cool on me... so it must be okay.. as long as others here dunno what it means too'

Bah! Who gives two fucks anyway..?