Fedinstely 

1. an alternate spelling for definately.
2. when you trying to spell definately using a keyboard on a phone such as a blackberry.

I fedinstely wouldn't want to spell definately wrong.

Fedinstely by Briggs-Slya April 19, 2009

Fefinitely

"Fefinitely" when a drunk person confirms their plans to meet in the future but won't remember anything tomorrow.

Yeah, he said he will fefinitely call me tomorrow. I even had to write my number on his belly, but but I doubt he will remember.

Fefinitely by bkone January 3, 2017

Fedinitely 

complete certainty; without doubt; a term that is used for emphasis
also known as "fed" for short

I fedinitely just typed "def" into my phone and it auto-corrected to "fed," thus making "fedinitely" a word.

Fedinitely by riverdalebarchie April 3, 2018