A phrase used for the act of relieving oneself while sitting on the spread apart lap of another individual while they, too, are relieving themselves on the toilet. The latter individual is then considered the 'toilet seat'. This is typically done in the woman on top position.
My boyfriend and I had to use the bathroom at the same time and couldn't hold it, so we ended up toilet seating.
מאת jazryo 26 בדצמבר, 2010