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Clonic-tonic rythmic contractions of the gluteus muscle following an upward stroke on the medial aspect. Alternatively, blowing around the Anus produces relaxation and feacal unloading.
A positive Manushas Sign =

Manushianism: Triad of: Hypertrophy of the Gluteus maximus, altered posture/gait, and hypospadius.
by Dr Cunt March 15, 2010