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1.
A good way to smoke marijuana in your house without getting caught.What you do is turn on the shower in you bathroom and let it get really steamy. Then once it is steamy enough you light up your joint, pipe, bong or whatever you smoke your weed from, and then the smoke and steam co-mingle and you cant see or smell a thing.

This is a good technique to use in hotel rooms.
dude lets go steam box my bathroom.
by mhorittochelln June 23, 2005
 
2.
When you take an amazing hot shower, and you don't wanna freeze to death when you get out, so you close the door so that the steam will be trapped in the bathroom.
*Stepping out of the shower* Wow, I'm so glad I steamboxed the bathroom.
by BeefFlaps January 01, 2013