Nerd Seatbelt 

1. (noun) the buckling strap that connects the left- and right-shoulder straps on a backpack.

He strode confidently into class, purposefully unbuckling his nerd seatbelt with one hand.

Nerd Seatbelt by OUtlET December 29, 2005

The reverse seatbelt 

When you are getting a blowjob from a girl and you tie her braids around your waist ... So when she pulls away it keeps her strapped in on your cock... Just for fun simulate an offroad ride.

Paul asks himself if hollys hair is long enough for the reverse seatbelt or is he just getting handlebars for this ride.

The reverse seatbelt by Bigwhite83 May 26, 2010

Human Seatbelt 

The act of stopping abruptly in a car and extending your right arm across the passanger's chest just to cop a cheap feel.

Jessie: "Jeff stopped so suddenly"
Claudia: "Yeah, he totally just gave me a human seatbelt"

Human Seatbelt by phrezur_burn March 27, 2009

Emo Seatbelt

Those colourful silicone "cause" bracelets that you wear on your wrist. They interrupt the Emo cutting ritual.

Emo 1: "Dude. I was totally going to cut my wrists today, but my Livestrong bracelet got in the way."

Emo 2: "Dude! It's because you were wearing your Emo Seatbelt!"

Emo Seatbelt by Uncle Dal March 30, 2013

mom seatbelt 

verb- the act of instinctively placing your arm over someone or something in the passenger seat when slamming on the breaks in the car.

BREAKS SQUEAL!
Me: "Woah. I'm happy I mom seatbelted the pizza. That would've been ugly."

mom seatbelt by VannAleXX January 9, 2012

australian seatbelt 

When you reach under from behind to the front, invert your hand with a jerking motion to & fro.

I gave the homeless man an Australian seatbelt in exchange for a cheese sandwich and a half bottle of piss.

australian seatbelt by Dj_twel October 7, 2017

Seatbelt Strangle 

A seatbelt strangle is when your seatbelt decides not to let you free, and every time you try and move so it loosens, it only gets tighter. Ususally this occurs when you try and loosen the seatbelt aaalll the way, to the point where it wont go any farther-the belt will slide back into place, and suddenly you find that you wont be able to lean forward. Because of this trapped feeling, you start to panic and hyperventilate and soon need the help of another to unbuckle you, and save you from the Seatbelt Strangle hold.

Afterward you are ususally exhilarated and happy that you defeated an inanimate object and escaped the clutches of teh Seatbelt Strangle.

passenger: (pulls seatbelt to full extent) AhHHHHH!!! help! The seatbelt has got me! i cant move!!!
passenger 2: I'll save you!
passenger 1: AAAHHHH!! quick, i cant breath!
Passenger 2: (unbuckles belt)
passenger 1: thanks man, you totally saved my life.
Passenger 2: yeah, that was one heavy-duty seatbelt strangle you were in.

Seatbelt Strangle by TherealWaldo May 27, 2009