Being so unhealthy and obese that you are always in a state of sickness. Can be cured with a healthy diet, regular exercise, and some fresh air.
"I have to call off work again for the 27th time this month because I'm fat sick."
by fred durst 2 January 30, 2023
Get the Fat Sick mug.
commonly known as FKFS
-The effect when a fat (or relatively large) kid thinks that playing the wii will make you fit.
-may cause sudden attempts (from that fat kid) of actually being athletic when clearly their are not.
'wow nathan tottaly has Fat kid 'fitness' sickness (FKFS) he tryed to flex for some girls because he stayed up all night playing wii fit
by Jon DeYonker February 27, 2009
Get the Fat Kid 'Fitness' Sickness mug.