The act of being obsessed with, or fangirling over Josh Olds AKA Fatty, the bass player for Family Force 5.
Missy: "Sarah, do you have Fatty Fatigue?"
Sarah: "I think so... The way he twirls that bass just wears me out!!"
Sarah: "I think so... The way he twirls that bass just wears me out!!"
by melanderr August 2, 2011
Get the Fatty Fatiguemug.