Hi Mappanah:
Machincuepa is a word used in Mexico from the nahuátl dialect:
RAE:
machincuepa.
(From the nahuatl voice mayotzincuepa, to roll like a pumpkin).
1. f. Méx. Voltereta, pirueta, maroma.
dar, o echar, la ~.
1. frs. coloqs. Méx. Dicho de un político: Cambiar de partido.
hacer ~s.
1. fr. coloq. Méx. dar la machincuepa.
Somersault, pirouette. When a politician makes a "machincuepa" he changed parties. In daily spoken language, when someone makes a "machincuepa" means that such person fell down in a very visible way.
Hope this helps.
ILT