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!
And yet...a well-deserved nickname, did anybody else see that shower scene, the infamous towel?!
A - "But it's o.k. That I cheated on Mcdreamy with McSteamy because I'm working my way up the McEamy ladder"
Kyle: "No dude. Vern just gave me the best McSteamy ever!"
Micah: "Awesome. Wanna give me one...steamer?"