It depends on the context.
For example:
"Do I have food in my teeth?"
"No, you don't." (No, no tienes.) [No, you don't have.]
"I have a ferrari."
"No, you don't." (No, no es verdad.) [No, it's not true.]
"Oh no you don't, mister." (No te atrevas.) [Don't you dare.]
i dont think it is a word
It means, "I dont know"
I dont know what you mean
it means i dont know i hate my spanish class and my teacher but not the culture spanish
it mean literally "why you no i speak spanish" but is would sorta mean this "why dont you know spanish" change hablo to hablas
It means boy in Spanish. Chico also means boy in Spanish. Muchacha and Chica mean girl is Spanish.
negro (or negra for feminine) is black in spanish
"No quiero hacer" in Spanish translates to "I do not want to do."
Yo no se means i dont know in spanish
The phrase "de nada" is an interjection. It is used in the US to mean "you're welcome". This is also the Spanish translation for the same phrase.
i dont know i dont speak spanish.
i dont know how appropriate it would be to answer that but it means suck my di%k in Spanish