Derived from the slang term "the itis", which refers to the uncontrollable tendency to fall asleep after having a big meal.
Bust-a-nut-itis is the overwhelming urge men experience to fall sleep after having sex or busting a nut.
Wally: "..so when I woke up, that hoe had taken everything, my iPod, my Blackberry, credit cards..."
Buddy: "Sounds like a serious case of bust-a-nut-itis.."
" I had bust-a-nut-itis so my mom found me passed out in front of my PC with big booties on the screen, my pants around my ankles and lotion everywhere.. "