To have a big rest is very similar to cotch. It is basically resting for a large amount of time with disregard to other activitys that may need attending to.
Big Rest's are enhanced by any type of entoxicant.
History: When in the Hell did we start inserting “rest of your” in the salutation, “Have a nice (rest of your) day!”
I.E. When you leave a small tip, or in current times, when you frequent almost any establishment, and upon exiting the premises an employee will say, “Have a nice REST of your day!”