Here are some ideas:
It's an idiom.
simile
i think its an idiom, but i think the saying is "You lucky duck"
Nothing - it looks like some kind of abbreviation instead of an idiom.
It emphasizes uniqueness.
youre gay forevee
the kind that swim with sharks
youre moms cells
a wart? depends on what kind youre referring to.
If you are benevolent youre kind mean well to others.
lt depends on what kind of kit you have and what genre of music youre playing
happy and upbeat music