i made this word up and now it has spread, because i needed something to become the complete opposite of "shithouse", so obviously "sweethouse"! It comes in handy whenever there is an awkward situation and something really good just happened.
"Dude, THHAT'S SWEETHOUSE!"
When taking a shit, there is too much crap, thats fills up from the bottom and then makes an Island.
I took such a big crap, it made a Gilligan's Island.