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1.
The act of giving/getting the shaft while one or the other our both parties are using the toilet or the floor or just pooping wherever their fucking
"I want to fuck you so bad but I got to take a shit." Jane says holding her asshole. "Well why don't I join you and we can have toilet sex and you can shit on my balls!" John replied joyfully.
by Yetti June 17, 2006
 
2.
This is the act of having sexual intercourse while one of the party's is going the bathroom. It is very dirty and I am guessing not very popular. Although it is not popular some people are aroused by it.
Dane Derouin likes the feeling of toilet sex in his bathroom only.
by 9289515257 May 29, 2011