Could it be tardive dyskinesia?
Good call, Mel, on Tardive Dyskinesia. TD is apparently one of the more common side effects of a wide range of psychotropic drugs and is characterized by darting, twisting, and protruding movements of the tongue; chewing and lateral jaw movements; lip puckering; lip smacking; facial tortions and grimacing; finger tapping and hand clenching.
Or . . . . . he could be a lizard.