Shout out to my idrens
Put your hands up like it’s a mother fuckin’ siren

from K'naan (Ft. Nas) – Nothing To Lose Lyrics on Rap Genius

Idren-rastafarian way of saying children. He’s shouting out to the kids from his home country, and telling them to keep their head up.
The second line tells the kids to put their hands up like a siren. A siren goes up for alarms.

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