Okay you legal now
So show'em your ID
Lets get tatted up, tatted up
Who comen with me
Let me know, let me know
We about to go in
We grown now, Go anywhere

from Krushai – Legal Lyrics on Rap Genius

Meaning

Now that you are of age you can obtain a ID, Which means you can go where you want do what you want without adult supervision, Simple examples : “Tattoos, Piercings, What ever you like”

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