It is a spanish noun, means manipulation. It can be used when you take advantage of a person and use your abilities to obtain what you desire, then turning your back on them.
It can be translated with manipulation.
"Me siento re yoki"
"I feel so wily"
"No ves que eso es incorrecto? Eres un/a yoki."
"Can't you see that it's innapropriate? You're such a yoki."
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