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2.
A guy who, although you know would be terrible in a relationship, you would love to have hot, steamy sex with.
I - "Hey I don't need dating advice from someone who cheated on McDreamy with McSteamy"
A - "But it's o.k. That I cheated on Mcdreamy with McSteamy because I'm working my way up the McEamy ladder"
by J'Aime April 23, 2007
 
1.
Nickname for Grey's Anatomy character Mark Sloan. Dr. Sloan is played by none other than Eric Dane.

*SPOILER ALERT*
His character first broke up a marriage between Derek and Addison with a one-night-stand with Addison, which turned out to actually be a month long affair. He still has a thing for Addison, and Derek barely speaks to him. Oh yeah, and he hooked up with Callie!
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And yet...a well-deserved nickname, did anybody else see that shower scene, the infamous towel?!
"McSexy," "nooo," "McYummy," "noope," definatley "McSteamy!"
by THEurbanchicka November 03, 2006
 
3.
When a midget dressed as Ronald McDonald, fucks a big stuffed dog through a hole cut just below its tail while getting his balls licked by a Filipino Hooker from below as he shits out the Big Mac he ate an hour earlier all over the hooker's boobs.
Midget- "Man I like using my big dog named Clifford for my McSteamy's. I think I ought to call over that Fillipino bitch Sandra and eat a Big Mac. That way I can do McSteamy before I lose Control of myself!"
by Bukake82 May 29, 2010
 
4.
a smelly, nasty, hellacious fart usually brought upon after the consumption of McDonald's food
After finishing his Big-Mac meal, Tyrone cut such a nasty McSteamy, all his homies nearly suffocated in his Escalade.
by La Petomaine July 19, 2008
 
5.
A man takes a fat dump into the hand of his partner. The woman looks at the poo in excitement. The woman reaches out and grabs some manhood and then wacks him off until the end.
Micah: "Dude you totally smell like poo. Did you just shart or something man?"

Kyle: "No dude. Vern just gave me the best McSteamy ever!"

Micah: "Awesome. Wanna give me one...steamer?"
by KyleSmith13 August 30, 2007