Breasts that appear to be particularly, unnaturally, bouncy or lively. Term refers to the fictional material "flubber", created in the 1961 Disney film "The Absent-Minded Professor" as a mashup of "flying rubber".
A Flubberhumple is a great friend. One whom you can laugh with when times are good and cry with when times are bad. They are amazing. They shine like the Northern Star. God was showing off when He made them. Flubberhumples are once in a lifetime friends who carry something no one else has and that's what makes them beautiful.