A condition which occurs mainly in men, and results in red, slightly sensitive elbows, caused by prolonged friction with a couch, while in the missionary position.
"Hey Mark, did you see Steve? He's got some nasty Missionary's Elbow."
"Yeah man, he must have had a good time with Claire last night. He's got a hickey too."
Both - "Sweet"
Mark - "Dumb-ass wore a T-shirt though"