Jisho

Do you mean like, in a kind of slurring where the ん is part of んだ, something like うっせんだよ、お前は

I don't think that kind of construction deserves its own dictionary entry. That's something grammar books can give you info on, since what you've isolated isn't really one word on it's own. It's not in monolingual Japanese dictionaries either, from what I can see.