St. Louis Slingshot 

Masturbating and pulling back the penis while tea-bagging your partner. Then as you orgasm you let your penis flop down striking the person in the face and spreading goo all over.

Whilst a young lady is enjoying a teabag session. The courteous male would hold his phalice out of the way so he can see her pretty smile. He continues to masturbate until orgasm and as he reaches his climax, he lets go of his penis slapping the young lass right in the eye delivering a perfect st. louis slingshot. OOOOH, that's gonna leave a mark. Welcome to St. Louis.

St. Louis Slingshot by arhandjeo April 7, 2008

double barreled slingshot 

a brassier (jocular, from the shape)

Whoever hung that double barreled slingshot out here must be fat. Talk about streched out.

double barreled slingshot by Light Joker December 10, 2006

German Slingshot 

You’re going down on a chick while she lies on her back. You reach behind you and sneak a dump in your hand. With a huge overhand windmill motion, you slam it down on her chest. WHAM!!! The German Slingshot.

I totally nailed a girl with the German Slingshot last night. It looked like she got shot in the chest with some sort of Crap Cannon!

German Slingshot by Capt. INTENSITY September 8, 2009

California slingshot

Using the shoulder of a five lane freeway to pass a slow moving car in the left hand lane. Often this move is made by a douche bag that is driving a late model European coupe or sedan.

Son (sitting shotgun): Wow Dad! Look at that BMW pass that car up ahead.

Father (driving): Don't ever do that shit!

Son: Do what?

Father: The California slingshot, son.

California slingshot by coined by T. Hoffman January 23, 2008

Canadian Slingshot 

Quickly pulling across multiple lanes of traffic without signalling. Most commonly done immediately after getting on the highway.

Holy fucknuggets! Did you see that dipshit pull a Canadian Slingshot? And right in front of a cop, too!

Canadian Slingshot by Fat & Furious December 21, 2013

Arabian Slingshot 

The act of shitting into a sock and then proceeding to smack an individual (usually of dislike) in the face with the pile of excrement.

as usual, Zack would not shut the hell up today, so I decided to give him a good whack with the ol' Arabian Slingshot to silence him.

Arabian Slingshot by thatguywhotriestobefunny July 29, 2011

Westmont Slingshot

Upon reaching climax during fellatio, the man places his left leg firmly against the woman's thigh and yells "make it stop!" Then, he rapidly extends his leg, firing the woman into the wall, or whatever happens to be behind her.

This chick was giving me head, and it felt so good that I executed the Westmont Slingshot. She ended up in the bathtub.

Westmont Slingshot by SSWN, LHE June 11, 2006