To pull a practical joke in the same manner as with an april fools joke but to horribly misspel it.
Writing on a school chalkboard without paying attention on the first day of April, APRIL PHOOPS!
When you have to crap really bad so you rush to the shitter and sit for a couple of minutes and then you just fart nothing comes out but air and it echos across the whole bathroom.
Did you just hear that?
Yea, I think he just phooped
When you fart and shoot a poo pellet ( the noise it makes coming out)
Thought I was done then the phoop came!