I think it’s just a brain fart, and it happens all the time to lots of people. There’s a performer (Terry Foy, a/k/a Zilch the Torysteller) who actually makes a living at it.
I wouldn’t worry about it too much, elfje. We all slip up periodically, and as long as you aren’t showing other signs of impending dimentia (disorientation, personality changes, fantatical admiration of Barry Manilow, etc.), you’re probably not going senile.
Enjoy your Spoonerisms! They’re fun.
My favorite: The Dear Old Queen -> The Queer Old Dean.
On the “blooper reel” of the “Usual Suspects” DVD, Gabriel Byrne was supposed to say “There is no Keyser Soze.” Instead, he starts to say “There is no Sizer Ko–” and catches himself. (Note: “Sizer Kozy” would not mean anything, it was just an amusing twing tuster.)
I do them all the time. I attribute it to speaking too fast. I try and control it but if I’m not thinking about it I’ll talk a mile a minute and trip over my tongue lots.
Back in my BBS days, when Off-line readers were the rage, people used taglines, which were kind of like sigs. One line of jokes, silliness, whatever.
There was a guy on Fidonet who drove me even crazier than everyone else on Fidonet, because he would “sign” his taglines. For some reason that bugged me, especially since they weren’t nearly as witty as he thought they were.
The one that drove me bonkers was this:
“Sleudian Frip”. That’s all. Every time I saw it, my brain went crazy. "What the hell? Sleudian Frip? That’s not a Freudian slip, that’s a spoonerism of “Freudian slip.” What’s the frickin point?
Sorry, didn’t mean to go crazy again. It just has that effect.