i ned a shet - A dirty shortcut for I need a poop, like when your brain is

A dirty shortcut for I need a poop, like when your brain is too lazy to spell shit and your face is about to burst.

I ned a shet, my face is gonna explode.

I ned a shet, I'm gonna pass gas in front of my teacher.

I ned a shet, I just drank a whole soda.