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1.
Similar to what happens in Vegas stays in Vegas. If you are having a private conversation that is not to be repeated you say "Vegas Rule".
Hi Joe, I need to talk to you "Vegas Rule". OK?
Vegas Rule on this, Shirley is a real b----.
by Dolores Kadien June 13, 2007
 
2.
"Vegas rules" is a phrase that comes from the a story where a gambler in Vegas cannot pay his debts and has his arm broken for his trouble. it's Common meaning simply states that if you don't complete a certain task ( Normally paying your share of a bill) "Vegas rules" means an unpleasant and usually violent thing happens to the offending party
P1: Hey can you pay your side of the bill
P2: Erm...sorry nope i have no money
P1: well Vegas rules
P2: Crap!
by Apoll0 June 13, 2012