Top Definition
Any fitness obsessed busy body who judges all life from the scale, tape measure, BMI, etc. and gets pleasure out of analyzing the health and the self-perceived imminent death of anyone he/she comes in contact with who disagrees with them.

Also often coupled with delusional belief that they will: A) Never become ill. B) Never die.
" I don't care if your blood pressure and blood sugar are normal, if you don't lose that last three pounds you are gonna die die die !"

" When are you gonna relax and stop being such a Fitso, I swear ?"
by Sir HIIMX August 17, 2009

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