When you have to shit so bad but you can't because you are in an inappropriate shitting venue so you hold it with all your might. Finally when you get home you either can't shit or you have a shittack because you held it so long. not a good poo. this is a missed plopportunity.
Uh dude, my stomach is killing me...I really had to shit before but alas, it was a missed plopportunity