When you fill a spoon with lube and stick it in your orifice in order to lubricate your ass, then you continue to shovel the lube into your orifices.
Rupert: I wanted to try new things with Gertrude. What's the best way to lubricate my anus?
Mallory: The best thing is the slippery steam train, you'll be more slippery than ever before!
A short shimme followed by a gentle moan, performed by a female after a particularly intense lip engagement. Females will not perform a "steam train" at the beginning of their menstrual cycle
"Yo bro, that encounter was so intense she steam trained like an elephant!"
"She didn't steam train last night, what did i do wrong?"
Where you tuck your penis inbetween your legs and die down on your stomach, masturbating from behind. It should look as though you are a train blowing steam.
Derrick was amazed when he walked into the room to see Tom performing a pristine Canadian Steam Train.