What does it mean for a breast lump to "move"?

Hi all,

 

I’m new to this forum and have a question about what people mean when they refer to a breast lump which is “moveable”. I am 21 and have found a small, hard, smooth-edged lump in my right breast. It is painless, and when I try to grasp it with two fingers, it kind of slips out of reach, like it is slightly rolling between my fingers. Is this what people mean by moveable lump? 

Thank you! x