Not sure if anyone has decided on a short version, it seems to swap between "Yer man," "Yonder," and "Irish."
On the other hand I'll generally repond to "[insert generic insult here]" as well...
I think only Geezer shouts "Irish"... I've adpoted "Yonder"

BTW: Will the fight against Emu be in loincloth with clubs? Will you have a dance off instead?