Top definition
A nipple knife is when a females nipple gets really hard and could be used to cut open a potato or any other hard object a knife can handle.
Last night my girl friend had her nipple knife out cutting the potatoes and slinging them into the hot boiling water to turn them into mashed potatoes.
by Hairythehippo November 04, 2014
Get the mug
Get a nipple knife mug for your fish James.