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Random
When you are high off cat nip, or any cat nip related product.
When it is so cold and your nips are so hard you HAVE to put on a sweatshirt to cover them and they still stick out....
Damn, last night it was so cold my girl was straight up tit-nippin!
When your nipple outline protrudes from your outermost layer of clothing
Last night when John had to walk home in the cold, I noticed him nippin due to the lack of winter clothing.