What does "though" mean in these sentences?

I knew these are American English sentences, and they are informal. However, I would like to know what exactly it means, or it simply means nothing, and people merely want to add something unnecessary at the end of a sentence, because it sounds fetch.

Sentences like:

1. His denim jacket, though.
2. I love the way he talks, though.
3. For real, though.
4. Really, though.
5. What's up though
6. When are you coming over, though?

1 incomplete sentence 2-6 It implies a contrast.

"He's a bit of an idiot. I love the way he walks, though."

EDIT: I've recently heard phrases like the OP's #1 His denim jacket, though

It's slang, but the best way I could put logic to it is that it implies that one could notice a lot of things about this person, but the jacket supersedes all other noticeable traits. (Thus, the comparison) It can be used as a compliment or put-down.

Those shoes thoough! (A ragged pair of sneakers or a fancy pair of snake skin business shoes.)

This goes along with @Edwin Ashworth's comment.