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Lads rule is when you're the last few jerks still wide awake after a night of drinking. You get all the beers that everyone else left behind. If someone won't give you their beer, just say lads rule and they'll give it up or else you'll make their life a living hell.
I'm not giving you my beer.
Lads rule. You're dead to me now.
I'll haunt your dreams if you don't give me that beer.