Gaynious is an expression used as a sarcastic comment for naming a person that has done something stupid (like genious) but also insinuates that that person is gay.
Marko: Central heating is harming the world Jurus: You mean global warming?
Marko: Oh yeah that's right
Jurus: Fuckin' gaynious
adj.
1. An individual (whom is either openly or secretly gay) eager to learn more about another individual whom has been identified as gay: curious gay men or women investigators. In some cases, the inquirer (or "gayrious" person) may not want it to be apparent about the level of curiousity.
2. Unduly inquisitive about a gay individual; constant wonder and fascination
I think he's very gayrious about Peter. Why else would he be asking all of those questions specific to the club last night?