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1.
When one initially goes to urinate only to realize the pressure applied is pushing feces dangerously close to exiting the anus, requiring a quick turnaround into the sitting position.

Phenomenon is almost solely observed in males, although is occasionally practiced by females in hardcore porn.
It was quite embarrassing having to make a poo-turn from the urinal to the stall at the office.
by SHLA April 28, 2011
 
2.
to flush, zip and exit the stall only to realize there's more. . .
"I had to make a poo-turn when that chili dog came through."
by skukuza May 24, 2007