Sendeh is a derogatory term used to describe Indians who often smell bad and dress ugly. It is often used to express frustration with low skill or incompetent Indians workers who claim to be smart and competent.
A Maoist guerrilla insurgent group formed in Peru in the late 1960s as a splinter group from the communist party of Peru; is among the most ruthless guerilla organizations in the world; seeks to destroy Peruvian institutions and replace them with a Maoist peasant regime; is involved in the cocaine trade; Shining Path has been responsible for 30,000 deaths.
One's bias towards their own opinion—as a result of being the original poster, sender, or equivalent—on social media forums, especially when accompanied by a sense of self-confidence or entitlement by the sole act of sharing their opinion on said social platform.
Why was the sender supremacist certain that the Earth is flat? Well, it's because he sent it.
Reddit is widely considered to be the best example of sender supremacy. Either your viewpoints must entirely align with that of the sender, or you are cast off as an unknowledgeable internet troll and promptly downvoted to oblivion.