1.) a hot chick. When you are with your friends and you see a hot chick, you say, yell, whisper (whatever the situation) 'hairpie' to get your friends attention. They will then give their approval or disapproval of your observation with a nay or yay.
When, after givingoral sex to a woman with a hairy vagina, the dude has a few pubic hairs stuck in his teeth.
I had a job interview that I thought went great. I did not get the job and when I got to my car I looked at my face in the rear view mirror and saw a bunch of pubic hairs in my teeth. I realized this is why i failed in my interview. After giving Sophia head before my interview I forgot to check my mouth and floss. This fucking hairpie crisis caused me to blow my interview!
A jock-strap like device worn by women to prevent their excess vagina skin from sagging and hanging out of their shorts or skirts.
(WARNING!: A Hairpie Hugger is not to be worn with thong due to recorded side effects of possible braintooth, iphone malaise, finger grumblage and minor heart explosions.)
"Hey....I couldn't help but notice your vagina is hanging out."