As a child playing games of knights in armour or cowboys etc the game sometimes got 'physical' and required a truce which was agreed by one of the combatants shouting 'veinites'. Talking to friends I find there are derivations of this which include Fanites, Vanites or Veynites and in some instances it was replaced with the word 'injected'.
Hearing the word again today I looked up its origin to find it derives from old French 'se fendre' to back out, esp of battle.
On occasions the shouting of the word was also linked to the crossing of one fingers in clear view.
Anybody else have experences of this?
scoobydoofus
Pro 
I can remember "injected" - I suppose it was something about being immunised, immune from playing for a few minutes.
In Birmingham we used to say "arley", which was short for "arley barley". A quick google search tells me that it too comes from French - "allez parler", or go and talk it over. So there you go.
In the village in Wales where my grandparents lived the kids said "clicking clogs", which we found as funny as they found "arley barley".