What is the meaning of Fib?

A lie, especially one that is more or less inconsequential.

A liar.

To lie, especially more or less inconsequentially.

The fibula.

To punch, especially a series of punches in rapid succession; to beat; to hit; to strike.

A kind of experimental poem where the number of syllables in each line is the next succeeding Fibonacci number.

weakness

Source: wiktionary.org