Definition of flexes:
(n) :
(uncountable) Flexibility, pliancy.
(n) :
(countable) An act of flexing.
(n) :
(countable) A flexible insulated electrical cord.
(n) :
(uncountable, chiefly UK, Ireland) Any flexible insulated electrical wiring.
(n) :
(uncountable) Flexible ductwork, typically flexible plastic over a metal wire coil to shape a tube.
(n) :
(countable, slang) An act or instance of flaunting something; a boast or brag; something considered impressive.