Used other than figuratively or idiomatically: see do, it.
To urinate.
To be appealing or suitable.
To have sex; make it.
To do something exceptionally foolish or unacceptable.
To run fsck on; to perform a fsck on.
A *nix file system check to detect damage to, or corruption of, files or filesystem structures.
The tool, fsck, that performs a fsck.
Fuck.