When you froze your arms
Niggas want to test you whenyour gun goes warm

from Jay-Z – Streets Is Watching Lyrics on Rap Genius

When you start to acquire accessories that flaunt your wealth, such as jewelry (froze your arms), people will definitely take notice.

If you’re living a life in the streets and have gained some affluence and reputation/ stature it’s likely because you’ve had to use your gun/ heater. When you stop shooting however, is when your gun goes warm. This is an indication that you’ve slowed down/ stopped shooting/ let your gun go warm.

Here you have two variations of heat in the two lines.

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