This is one from yours truly, but I think it would make an awesome dictionary word. I think I was trying to say “sweet” and “sleek” at the same time. Sweek came out. I think it’s a pretty sweek word.
Merriam-Webster, are you reading? Word candidate right here.
Incidentally, Urban Dictionary seems to have a different idea. I find their definitions a little “sweek” though. Comment if you get the joke!