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1.
When a girl takes a shit into a man's mouth, the man then proceeds to vomit the shit on to her chest. The man then begins to titty fuck the girl and uses the soupy concoction as a sexual lubricant.
"Dude, I totally had the best turtle head soup last night"
by Dick Bandicoot January 26, 2012
 
2.
An act of intercourse where the phenomenon known as a turtle head occurs prior to insertion of the penis into the anus.
My girlfriend really had to shit so before she went to the bathroom I fed her some turtle head soup.
by Fonkey January 29, 2006