You may have these symptoms if you have a proprioception disorder:
Falling when you walk across uneven surfaces
You don’t understand your own strength. For example, you may not know how much force to use when writing or picking up a brick
Uncoordinated movement, such as finding it hard to walk straight
Balance issues, which can lead to problems when you walk up or down stairs or cause you to fall.
(From WebMD)
Oh. So, proprioception disorder is a euphemism for being drunk.