【英语】don't go nowhere怎么理解

【英语】don't go nowhere怎么理解
“See,I've been all around the world but I ain't (seen nothingX2)”
“u won't wanna go nowhere"
意思应该是 “我未曾见过（有价值的）东西” 和 “你不会想去别处”吧.
那为什么不是 ain't seen anything &won't wanna go anywhere?
ain't seen nothing& won't wanna go nowhere（双否定）怎么理解?
请结合语境好吗？蹩脚的就别发出来了。我已经解释了意思。问的是原因。是否存在习惯用法，强调或语法点之类的。
See,I've been all around the world but I ain't (seen nothingX2)
Like you,don't matter where you're from,it don't (mean nothingX2)
See,I've been all around the world but I ain't (seen nothingX2)
And now I got four minutes to take you back,girl we can (be somethingX2)
I can tell you want me too
And every time I think of you
That luscious juice your lips produce
I can taste that sweet LOVEJUICE
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Imma treat you like a teddy bear
You won't wanna go nowhere
In the lap of luxury
Baby just turn to me
You won't want for nothing boy
I will give you plenty
Touch my body
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