(adj.) meaning, to be very strange or to be like a sketch, not all there
Wow, that dude is so sketcho, he is touching himself inside his trenchcoat.
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Meaning someone or something sketchy and/or ghetto. Usually people like stoners or emos are sketcho. Things like ripped jeans or most things from Hot Topic are sketcho. I think you know what i'm talking about.
That purple and blue hat you're wearing is really sketcho.