When one trys to do something once and that is all that is needed, or when one simply performs a task once and it is complete.
This can be used even when playing sport and you only win by one score. Aswell as when you go to a fast food restrant that often makes mistakes with your order, but thay get it right first time. It is a statement or decliration stateing that you only had to try something once and then the task was completed requireing no more effort.
Tom: "don't you have to call work and tell them you wont be in?"
Tony "I all ready did, one and done"
Tom "Out of sight"
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