jah-ah-koo - Means Jah is Cool.
Also this is part of the lyrics of Skindred's song 'Ninja':

''The way dem ah gwan is like dem work for SATAN!

JAH-AH-KOO!

e.g.: Those suckers like Satan, they're lame, cause Jah is much stronger!
by alknet September 11, 2013
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