The technique from the 2 Tecs and I don't need two lips
To blow this like a trumpet you dumb shit

from Jay Z – Threat Lyrics on Rap Genius

Meaning

He’s not talking about an actual trumpet, but about a 9-Tec gun. He doesn’t need to blow in it, he just needs to pull the trigger.

This might also reference the Eric B' & Rakim song Don’t Sweat the Technique, which features trumpets on the hook.

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