1. The expression of not wanting to deal with something at the moment, or finding certain things unappeasable.
Origin: Derived from the phrase "Too Far" which had become too
long to say due to laziness, leading the use of just the
two letters "T" "F", which also, after so
long had become
two syllables too many, thus eventually leading to "Tiff."
It is often used to replace phrases such as; "Screw that," "Fuck this," "forget about it," etc.