Pshaw ! Everybody knows that this is the standard
mexican greeting. Yes, that's right, in
Xochimilco or
Tlalpan you go up to any friendly looking
cop, and say
that.
He will smile hugely and invite you to the nearest pub for a nice straight
tequila. Who knows, he may even let you try his gun.
It is also rumored that this magic sentence will get you free beer in any
Sanborn's.