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1.
The art of rubbing one out, masturbating, having a pull in the shower. The heated shower water creates an eerie mist (steam) hence creating a perfect camouflage for the act.

This widely used work has been derived from the saying "to blow some steam" - Steam Dog takes this saying to a new level.
My mum caught me having a steam dog.

a Steam Dog is the perfect way to get lost in the moment, like imaging yourself on the set of ghost.
by noodleluca February 03, 2011
 
2.
When your sexual partner farts on your finger while it is in their anus.
Dude, my girlfriend gave me a steam dog last night and I still can't get the smell off of my finger.
by Yoshi P. August 15, 2010
 
3.
The term given to the act describing fellatio while wearing a condom. (noun) It is derived from the theoretical accumulation of steam inside the condom while a blowjob is being administered by a warm mouth.
I thought we were going to have sex, so I put on a raincoat and then she started giving me a steamdog instead.
by NaderRalph August 24, 2010