Portland Steamer 

whilst someone is taking a hot shower, another individual uses the toilet in the same bathroom and drops a deuce. The shower's steam makes the stink all encompassing, usually trapping the showering individual as they don't wish to expose themselves to the person on the toilet.

I couldn't answer the phone as the Portland Steamer prolonged my shower a bit.

Portland Steamer by wastedseaman July 17, 2010

Portland steamer 

Eating a lobster roll while defecating and shimmying on your lovers chest.

I'm so glad we've incorporated shellfish into our lovemaking. The Portland steamer is a bounty of smells I'll not soon forget!

Portland steamer by Jarrid October 11, 2017