Meaning
The hand gesture of a raised finger (or two) pointed up like a gun, thrust into the air to salute a hot tune in the dance — the dancehall crowd's sign of approval, often with a shout or a whistle. 'Gun finger inna di air' is the visual roar of a crowd loving a track, a symbolic 'gun salute' descended from the real blank-firing of earlier dancehall days.
Examples
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When di tune drop, gun finger inna di air.
When the tune dropped, fingers went up in salute.
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Di whole dance put up dem gun finger.
The whole dance put up their gun-finger salute.
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Dat tune get pure gun finger.
That tune got a huge finger-gun salute.
Origin
From 'gun' + 'finger'; a finger-gun gesture saluting a tune, a symbolic 'gun salute'. See [[buss-a-blank]], [[wheel-and-come-again]].
How it’s used
The raised finger-gun crowd salute to a hot tune. See [[buss-a-blank]], [[forward]].