Grammar behind 届けねえとなんねえな > Context: an employee which seems to deliver something for a store. My take on the first half is: Well, (if I don't deliver/I have to deliver) it while I'm still full of vigor/energy... What's with the part? I can't get anything out of it apart from the at the end.

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It's a colloquial, contracted pronunciation of...

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which means "have to deliver".

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Related threads:

* What is ? What is its original form?
* vs in My Boss My Hero



As you may know, means "have to" "must". (≈)