What does fibbingest mean?

"Fibbingest" is not a standard English word. It's likely a playful or informal variation of "fibbing," which means telling a lie, especially a small, insignificant one.

The "-est" ending is added to create a superlative form, similar to "biggest" or "smallest," suggesting something is the most fibbing or the biggest liar.

It's important to note that "fibbingest" is not commonly used in formal writing or speech.