1 definition by Goonga Lagoonga
When your spouse or partner is sitting on the toilette peeing or pooping, the other person sits on top and poops through their partners legs.
My wife was using the toilette, and I had to go really bad, so I asked her if it was alright if I took a Siamese Poop. Of course she said yes.
by Goonga Lagoonga May 23, 2018