Phantom feces is when you have to hold your poop for a long time because there is no place to go. But by the time you get to a toilet the poop is no longer there. It is a fantom feces.
"I have to poop so bad."
"Hold on dude, we will be home soon."

20 minutes later arriving at home, "you can go poop now."
"Oh I don't have to go anymore, it was phantom feces."
by StinkyTacoKisses December 2, 2017
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