this fine phrase is used as a modern day equivalent of 'less is more' in regards to partners shomer, meaning to guard in hebrew, and mars bar, in direct reference to a well known nougaty chocolatey treat combine in this well known phrase as a means of refraining from physical contact with the opposite sex.
whilst its ancient origins are some what unknown today,it is believed that its original roots are based on a scale of sickness.
one mars bar= perfect. its really nice innit?
two=umm feeling a bit sick now
three= i really dont want another mars bar
four= ewww get it away from me
..... etc
The Jewish day of rest. That means that you don't work, you don't drive a car, you don't fucking ride in a car, you don't handle money, you don't turn on the oven, and you sure as shit don't fucking roll!