cut the truffle
While during the act of farting, a little nugget of poop accidentally escapes. Similar to cut the cheese but with an unwanted surprise.
"What's wrong? Why are you- OMG! Did you cut the cheese?"
"Nah man, I cut the truffle."
"Ugh! You so nasty!"
"Nah man, I cut the truffle."
"Ugh! You so nasty!"