Elbow

Dictionary.com definition
el·bow
[el-boh]
- noun 1. the joint between the upper arm and the forearm

McKinsey Veenker's definition
el•bow
[pain]
- noun 1. Causing greats amount of pain 2. Sleep losing mechanism

Anyway if you haven't caught on my elbow hurts!

*sorry to complain but it's the only thing I can think of right now!