Tendernitis is a medical condition where the elbow becomes tender. This is usually accompanied with mild pain. Sometimes it will be called tendonitis either on accident or because, since tendernitis isn't actually a real medical condition, the person needs an excuse for their arm hurting.
Peter: "My arm hurts. I think I have tendonitis."
Phil: "Suck it up, pussy. You just have tendernitis."
Phil: "Suck it up, pussy. You just have tendernitis."
by Phil Mcloser May 16, 2007