Restless Leg Syndrome 

When people sleep, their legs continue to move. This can be easily mistaken for a dream, when really they are suffering from a disease that does not allow them to stop dancing. It is terrible disease because people are not able to get enough sleep. This can lead to deteriorating physical and mental health.

A: I wasn't able to sleep last night because your legs kept moving.
B: Well, I suffer from Restless Leg Syndrome. I cannot keep myself from dancing while I try to sleep. I was doing an Irish Jig last night. That's the worst one.

Restless Leg Syndrome by joegunnar March 12, 2011

Restless Leg Syndrome 

Restless Leg Syndrome is where ones leg will not stop moving. Even when sitting.. Usually making an annoying noise to everyone around them.

Bloody Barry, he's got Restless Leg Syndrome, it's so annoying.

Restless Leg Syndrome by CWKlaus May 9, 2016

Restless third-leg syndrome

1. The inability to control one's penis, and, therefore fucking everything in sight. Generally it is men who are afflicted with this disease.
2. An excuse whoring men give for being unfaithful.

"Baby, it's not my fault you caught me with the Maytag repair man in a 69! It's my Restless third-leg syndrome acting up".

Restless third-leg syndrome by BaJinxy August 29, 2007