SImply it is one who dips a lot. This can take on a lot of forms. Examples include, but are not limited to, someone who uses chewing tobacco frequently, or someone who likes to dip a lot while dancing or "grinding" with a member of the opposite sex.
Paul threw in a huge chawski last night. He is such a big dipper!
Wow did you see how many times he dipped on that chick during "Get Low." What a big dipper!