Supporter of the orange revolution 2004, later protester against Yanukovich in 2013-14. Slur derived from Майдан Незалежності (Independence square in Ukrainian), the meeting place of activists portrayed in Russian official media as foreign-driven, dangerous ultranationalist radicals. The same derivation can be found in майдануться, замайдаться, майдавошка, майдан с вами, майдай отсюда…
Спасибо майданутым за Крым! Скачите, дебилы, дальше: Скоро уйдет Юго-Восток.
Thanks to the majdan-morons for Crimea! Keep on hopping, jerks: Soon the Southeast will be gone.
(ЖЖ, 04/2013)