The act of standing with arms aloft, in a confrontational manner, shouting "Come on then, Let's av it, Do you want some". The estuary haka is often done from the relative safety of behind a police cordon.
There is nothing quite as funny as the hate contorted face of a 19 year old, standing on a plastic seat ,doing an estuary haka at the opposition fans separated by nothing other than a wall, a 30 yard dmz, another wall, 300 stewards, 200 riot police and all the other supporters who are standing in front of him.

(from a post by surfaceagentX2zero)
by heppers August 27, 2009
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