fart sauna 

1.when one lets out a fart in a hot shower causing a horrible stench that the steam intensifies, making it a sauna of farts
2. something to tell people to make them smile while taking pictures

L. Man, I let out a horrible fart in the shower the other day. I almost threw up.
S. Oh man Fart Saunas are the worst!

fart sauna by PilotMSK January 2, 2011