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No, "sapien" is not a word.

"Homo sapiens" is a Latin phrase meaning "sentient man". It's singular. In English, when it refers to humans as a species, it is often used with plural verbs, but it is singular nevertheless.

American street talk has nothing to with this. It's just that on this particular occasion, this term was used to refer to one person rather than to the humankind, hence the singular verb form.