Kosmikh is usaully a person who's completely stupid and sometimes tedious. A kosmikh guy does nothing but dumb things and doesn't understand that he's such an idiot.
This word is also said to somebody does something very very stupid and then looks at you like he knows something and you don't!
Bitch: doggy you mean missionary, oh my love, come over me...
merXad: You fucking kosmikh cunt!