Buddy you’re a young man hard man
Shouting in the street gonna take on the world some day

from Queen – We Will Rock You Lyrics on Rap Genius

This line is part of the transition through life of the boy, and right now he is in his rebellious teens/young adult.

The boy has grown into a “hard man” and now instead of just playing in the streey by kicking the can, he now shouts in order to attract attention.
If he keeps going down this path, he will be beaten by someone at the end.

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