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A word used to describe the combined human state of a) having a lack of physical and/or mental energy (tired, worn out, etc.) together with b) the feeling that you really cannot be arsed to do something specific or indeed anything at all.

Most likely British in origin.
What's up dude?
Not much. I'm just lacking arsergy right now...

You coming out to get wasted tonight?
I have no fucking arsergy tonight - I'm staying put.

What have you been up to?
Nothing - I've had no arsergy all day.
by Red Hot Chilli Girl February 15, 2009
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