A tubby violin.
A tubby fishing boat.
tubby bald men were cute!
tubby tummy and lost sight of your twinkle toes?
There's nothing wrong with that, but you'll also meet some tubby beasts who like to spit mud/vomit/pee-whatever it is that will burn you.
I've seen pictures of really quite tubby men merrily lifting themselves up on these things, that's like doing a half pull-up!