The Mamushka, "the dance of brotherly love", is a traditional dance performed by Addams Family men. It has been a tradition for a long time. It is danced when celebrating something grand. It was taught by the Cossacks in the Addams Family.
"The Mamushka, ha-ha! Taught to us by our Cossack cousins, the Mamushka has been an Addams Family tradition since God knows when. We danced the Mamushka while Nero fiddled...we danced the Mamushka at Waterloo...we danced the Mamushka for Jack the Ripper. And now, Fester Addams- this Mamushka is for you"