An exclamation following the minimal amount of work required to install an item requiring a non-trivial amount of work to install properly.
May also be used when completing any non-trivial task in a half ass manner.
Kramer places a large air conditioning unit on the sill of an open window and secures it by lowering the window's blind until it rests on the top of the unit. Proud of his work, he exclaims "Installed!"
When installing a program onto your computer it sometimes takes a ridiculous amount of time to do it, or it takes ages and then does it all at once - a bit like constipation.
Ronald: Hey Jeremy, flight simulators is taking the piss to install, fuck it, i dont want to play that shit game anyway.
Jeremy: Hmm looks like you had a classic case of installation constipation there mate. Why the fuck did you want to play that anyway you complete bell.