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When one cannot leave the spa to go to the bathroom, instead, using the spa (hot tub, jacuzzi or similar) as their own private bathroom.
Example 1. Hey Sean, great spa, though I gotta get out and pee, where is a towel?
Forget it Kev, this is a spathroom!!

Example 2. Hey Andy, I thought you didn't have a spa?
'Its OK, I haven't, just turning my regular bath into a spathroom.
by k&S reProductions April 10, 2009
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