A word created by the great W2S, who in a Sidemen Countdown video created this wonderful seven-letter word. The word neek means a dull or unpopular person, and at the time, KSI was fat so they linked well.
A fatneek is rambunctiously overweight and is "bulking"
KSI's reddit : KSI is turning into a fatneek after the fight
KSI : Nah famalam your moving mad
A term used by the words: fat & nerd. It basically means ''fat nerd''
A guy who thinks he's 6 foot, and is "Bulking" before he fights someone
KSI is a Fatneek