My g/f’s daughter came up with this one long ago.
cigadent - any accidental burn caused by an errant smoke®.
I came up with a word once and a co-worker added to it…
zarquaminous: being greater in size than enormous, gigantic, etc., except when referring to strawberry shortcake, then it means “extrememly moist”.
[hijack] This thread reminds me of my absolute all-time favourite scene from Blackadder…
[/Hijack]
Lobsang that was funny.
My daughter accidentally came up with “severious” – obviously both severe and serious. We use it all the time now.
circumsuction: to stand in one place while vacuuming in a circle all around oneself.
The word ‘boredodiedom’ was spawned accidentally once when the utterer meant to say ‘died of boredom’. (the ‘f’ being silent in the pronunciation of ‘of’)
I have been corrected by said daughter. Her pita was defunctional and dysfective. Said daughter has also informed us of her plans to study liguistics at a US Midwestern university. I have no doubt that she will.
Vlad/Igor
Shirley, I think the word you are looking for in your OP, that feeling you get when you forget whom it is you’re calling at the moment, is callzheimers.
UnniceFailure to be nice (not purposely been mean, just not doing what one wants). I am trying to convince my husband that it is a real word, he says that that’s unpossible. 
Blud. The blue liquid that they use in tampon commercials.
rectum (re-defined use of real word). Having ruined a pair of shoes.
But aren’t they niblings because Niece and Nephew both start with N? How about Unts, since they both have an U and an N in them? 
I may be the sole beneficiary, but I sure could use the word churk – a place of worship one attends in the capacity of a paid employee, and not a member of the congregation/faith. “The church where I work” is too cumbersome a phrase and “I’m off to play the masses” (I’m a musician) sounds like I’m going to a carnival/horserace or something.
We always used neicephews to denote neices or nephews. I guess the grown up version would be auncles (pronounced like ankles)
hacklag - the time between getting a really bad haircut and having it grow out.
Prossible—A bit more certain than “possible,” but not quite as much as “probable.”
The only problem I have with Unts is that it reminds me too much of a Kipling poem about camels Oonts. And, umm… some people may have some problems with their aunt and uncle, but that’s just too harsh for me.
‘Kneepits’ for the bits behind the knees.
Utohflush - The feeling that comes over you when you realize you’ve just done something incredibly stupid