1 definition by Harper456

Noun. One of two forces that cause breasts to slowly sag towards the floor. Along with gravity, the force of grabity causes a constant pulling, rubbing, tugging and stretching of the breasts. The force is propotional to the sensitivity of the breasts and the attractiveness of their owner and increases exponentially in the presence of horny, attractive men.
If it weren't for the force of grabity I'd still have a "B" cup.
by Harper456 April 7, 2011
Get the grabity mug.