'spleening' is a non obvious mispelling of the word 'spelling'.

however, my recommendation for the weekend is to add the letter 'w' after 's' if the word begins with an 's' followed by a vowel (doesn't apply to words beginning with an 's' which don't have a second letter as a vowel).

a couple of examples:

* my mother just swent me an email swaying how much fun she's having.
* swomeday this will all make swense
* sweaty swedes swim swomewhere

if you can involve a squelchy mouth noise whilst speaking the 'sw' bit then that would be ideal. image in cross between a cough and a sniff and you are halfway there.

update: my colleagues swara and swally aren't very impressed with this cunning plan. oops