When a woman milkstamps someone and she is not wearing a bra or any brassiere like mammary restraint and she is not wearing a shirt or any torso covering clothing. I.e. a milkstamp from a completely topless, naked from the waist up, and bare chested, woman. It is considered the greatest of all milkstamps.
Did you see that topless woman give that guy a whole milkstamp? Lucky stiff!