Stair Master 

Doggystyle Intercourse on top of a flight of stairs, when the male knocks out the feemale's arms and rides her the entire way down.
Also see bobsled.

Nicole will be eating through a straw for a few weeks because i gave her the stair master.

Stair Master by Josh Aussems March 25, 2005

Stair master 

Getting a blowjob on a stairwell. Often this causes the shakes, especially when done outside your neighbors door. There is a certain covertness to this often when it is said.

Hey, my sexy Russian baby momma want to help me get in shape on the stair master when they pass out?

Stair master by Kiss Kiss & Hero March 30, 2016

Stairmaster 

A legend who is known to have sexual intercourse under flights of stairs at John Marshal High School. He Is now graduated and living the sauce life.

Student: too bad stairmaster isn't here anymore. I looked up to him so much.

Stairmaster by stairmasterisgnarly January 19, 2014

stairmasterbating 

To engage in an intense exercise or fitness regime which causes one to ignore relationships and responsibilities; usually a short-lived affair seen at the beginning of the year and immediately prior to bikini season.

Jessica: "Sorry I didn't call you back. I was on the treadmill. I love the way I feel now that I'm losing weight!"

Martin: "Well, I swear to God, if you don't answer the phone again because you're stairmasterbating I'm going to come over and poke Rocky Road down your throat."

stairmasterbating by vaguelyethnic March 29, 2010

Cleveland Stairmaster 

While walking up a flight of stairs, taking a projectile shit or sharting (fart & shit at the same time) on the person behind you.

Guy 1: Dude you wouldn't believe what my girl did last night!

Guy 2: She didn't fake it?

Guy 1: Nah, I was walking up stairs behind her and smacked her ass and she suprised me with a Cleveland Stairmaster!

Guy 2: Dude....

Cleveland Stairmaster by Skadandy88 December 14, 2010

stairmaster 

To totally own, abuse, or dominate.

He really stairmastered his nuts on that firehydrant.

I'll stairmaster that loser.

stairmaster by chad&friends April 15, 2003