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when you're wearing a shirt with out a bra and your nip slips out and you can see it and the public is like "WTF, YOUR NIP IS OUT!"
dude your nip is out, wtf its a nipslip.
Nipslip by hrtagm May 5, 2011
My girlfriend where’s top at work we’re she always has nipslip
Aimee is at work bending over low top nipslip
Nipslip by aimeesexylips September 20, 2020

Unfortunate Nip-Slip 

The unpleasant moment that occurs when a mans "scrumptious hard nipples" appear through his tight shirt. This moment can be made much worse when the man bears "man-titties". This appearance will normally cause cringe, disgust, or hilarity to others.
Patrick: Bro, did you see that? That sight will never leave my mind.
Juan: Damn what'd I miss?
Patrick: I just witnessed an unfortunate nip-slip
Unfortunate Nip-Slip by Cheese34 September 15, 2016

nipliptical 

A sexual partner used as exercise equipment, specifically for aerobic, standing, rear-entry penetration. To qualify, the penetrator must manipulate his partner's nipples.
co-worker: "Bob, you're looking fit."

Bob: "You bet! It's amazing what 10 minutes a day on my nipliptical does for the glutes."
nipliptical by Bachelor boB May 19, 2007

nip slip 

When a braless female's nipple accidentaly slips out from under a loose-fitting garment
Hold up, pause it there. Yup, total nip slip!
nip slip by Anonymous November 2, 2002

Freudian nip slip 

When you mean to flash someone a nipple but you accidentally flash your bait & tackle
He gave us the old Freudian nip slip and we all got a big peak at his one-eyed willy