Involuntary movements in certain neurological disorders such as Parkinson’s disease or psychosis; generally a side effect of medications used to treat the disorder.
Example: After taking neuroleptics for more than twenty years to treat her schizophrenia, a middle-aged woman displays sucking, licking, and pouting movements.
This website is a great resource for more information about this issue: http://www.ninds.nih.gov/disorders/tardive/tardive.htm
Fournier, G. (2010). Dyskinesia. Psych Central. Retrieved on July 3, 2015, from http://psychcentral.com/encyclopedia/2008/dyskinesia/