Sdjkf is the computer equivalent of bleh. It is generally the result of a uncontrolable and unmotivated attempt at trying to type something coherent on a computer keyboard while not really caring what actually comes out.
This term is also occasionally come across in office documents when your 3 year old finds your laptop while you're doing something else.
An expression of excitement or enthusiasm, typically used to express the feeling of amazement or awe, often used in a playful or exaggerated way. It can be used in both positive and negative context.
This the point as where you can't get back to work. You are too bored to do anything so you decide to slam your keyboard.
At this point you will probaly get fired but at least your not bored.