Is "lackof" a word?
You are, of course, correct to point out, by implication, that it is not one, just as I am to point out that its unfortunate instance here resulted from yet another of my typgraphical errors (to which I admit and for which I apologise) as distinct from the kind of spelling ones to which I have by no means been alone in drawing your attention at one time or another.
It isn't my fault that you have the sense of humour of a five year old.
Methinks that you are being a little over-optimistic here, for if I truly had such a sense of humour, I might at least be able to recognise and understand what passes for yours.
Likewise, it isn't MY fault that you care so little how you spell certain words from time to time.
Have fun.
Let me hasten to assure you that I do, when it's appropriate to do so; there are other worthwhile things in life besides fun as well, mind you - even the averagely intelligent "five year old" understands that...
Best,
Alistair