In the English language, as in others, there are a variety of interjection words. Among these are some comprising an open syllable, like yeah and no. Others end in stop consonants, like yep (or yup) and nope. In conversational speech, these words often seem to be realized with no audible release on the /p/ - something like [p̚ʔ].
I think the correspondence of no and nope is clear; nope carries the same onset, nucleus, and definition as no yet adds an extra phoneme at the end. This is only slightly less clear with yep and yeah/yes, and I think they are part of the same phenomenon.
The creation of the words with the additional unreleased bilabial stop can easily be interpreted as speakers instinctively closing their mouth at the end of a short utterance, which produces an automatic [p̚]. Is this analysis correct?
Does something like this happen in other languages; if so, is it common? I am especially interested if it occurs in any languages and dialects that otherwise don't usually have unreleased word-final plosives or phonemic /p/.