A disease which makes the host a lazy bitch. Symptoms may include (but are not limited to) laziness, bitchiness, making excuses, not wanting to run, desire to sleep, and severe diarrhea.
If one catches the Boydinitis they should avoid contact with anyone as it is highly contagious. The only known cure of Boydinitis is running. See a doctor is depression or suicidal thoughts occur while infected with Boydinitis.
Person 1: (Uninfected) "Hey!!! We are about to run!!! You coming?"
Person 2: (Infected) "No. Go on without me I slept in."
Person 1: "Oh no. You have Boydinitis!!!"
Person 2: "STFU!!!"