A bum to waste ratio and size that causes an individual to unintentionally float to the surface of the water when swimming; flotation typically occurs bum-first in extreme cases.
Dang dude, with a buoyant bum like that there is no way she can go snorkeling with us.
A term of endearment for addressing a friend, loved one or partner that is a 'goob' or has a 'goobie' personality. A goobs is typically someone who is sweet, kind and extremely goofy in a lovable way.
Hey goobs, how long will you be staying at work, can't wait to see you!