Head Disk Assembly, the part of a computer's hard drive which stores the data.
Typically when a drive experiences the Click of Death (ake the OMGWTF I just lost my data) noise the head comes in contact with the disk due to the collapse of the micrometre thickess air bearing from contact with a particle, resulting in massive damage known as a head crash.

Normally the end result is a bricked hard drive, which is recoverable if you are lucky and have a couple of K$ to spend on data recovery in a clean room.

Interestingly a hard disk will instantly crash if opened up and smoke blown onto the disk while spinning, useful for demonstration purposes but ruins the drive

Sometimes a failed drive can be salvaged by the careful replacement of the head assembly from a donor drive, this is a last resort and can make things worse in most cases.

To cry like a sissy-girl after waking up to a Rusty Bishop on your head.

To be made irrelevant or obsolete by the emergence of a more flexible online tool.

References the adoption and usage of electronic encyclopedia Wikipedia over the conventionally print Encyclopedia Brittanica.

The most pompous person you can know. He's always looking out for himself and his ego is incredibly big. Don't trust him because he says one thing and thinks another. Maybe as a guy he is nice, but if he gets tired of you (and he will anyway) be prepared to be best friends with your girlfriend and forget about you.

A type of accent produced by ones anus. The accent affects the timbre and tonality of farts, and poops alike.

An anus accent may also refer to an ornament adorned on ones anus for the purpose of decoration.

Sterling Heights be the name of a city in which ye wiggers be livin'. This be the most scandalous town to step foot upon. Once you do, you'll become a known relative of what we call the 'Heights'. In the Heights, it's VERY common to see rude crowds of arabs livin at every other house down the block. They thinks they owns this shit, but i tells you, they doesn't.