Green’s Dictionary of Slang

(W.I./UK black teen) a sound made by the mouth, simulating gun shots fired in appreciation of something, such as a dancehall song etc.

1929		M. Beckwith Jamaica Proverbs (1970) 17: Befo’ pra’pra’ bring fight, mek ground s’ ripple.
2002		L. Kwesi Johnson ‘New Word Hawdah’ in Mi Revalueshanary Fren 102: Di beasts a Boznia / must be sanitary workaz / pra-pram-pram / inna new word hawdah.