Pug'Maw
Kog'Maw comes to us directly from the Void, which explains its unattractive appearance. Riot then thought that we could turn him into a cute little dog, and for that what better than a pug.
Pug'Maw is a skin with multiple strengths. First of all, you're a cute little pug in a world where there are scary monsters. However, your pug will do quite well when it comes to fighting, vomiting on your opponents. You have to admit that being killed by a pug that vomits is pretty humiliating. Finally, to add to this frustrating aspect for the opponent, I suggest that you rub your butt on the enemy corpses, once you are sure that no threat is lurking around.
Pug'Maw also has an excellent DPS. Once you're equipped with your BOTRK, Guinsoo and Lulu, stand in the front lane, press W and dispense some A-Click while moving backward: the skin will do the job for you! It's called the "Front Waf", because yes the character barks when he hits with this look...