When your computer is running slower than usual.
Me: Dude, my shit is running slow today...I think it has compstipation.
Creeyer: This is why you need to connect to the internet thru 'fiber'-optic cables!
When your computer decides to not work; if so, very very slowly and painfully.
*Smacks Computer* "Damnation!! My Computah's got COMPSTIPATION!"