What is milk sacks?

An alternate name for a strip club.

Me and Jim hit the "Milk Sack Shack" last night.

milk sacks - video

Milk sacks - what is it?

Large and slightly saggy breast. Used when sublty comparing person to a cow.

She had nasty milk sacks.
Look at the milk sacks on that whore.

What does "milk sacks" mean?

That ho has a beefy set of milk sacks!