The motion created from fornicating so violently that the breasts on the female, or sometimes the male, end up flapping and jostling about with great force. Usually the party suffering the bobbity wiggles experiences a great amount of breast pain afterwards.
"Man, I tappedthat so hard her breasts hurt."
"Was she suffering a mad case of the bobbity wiggles?
A soft squishy material, it can be used for many things. One, is Styrofoam swords of wrath. yes yes. another, is to wrap around an egg and stick it in a box with bricks so it doesn't break when you drop it off a building.