Dude, this comic strip says it all! Whether it has to do with the matter or not.+ George Bush is a retard. He probally thought that's how you say it.
http://angryflower.com/slappi.gif
Actually, look it up in the dictionary. The way he says it is an accepted pronunciation. In fact, several other presidents used the same pronunciation, including Bill Clinton.
Oh, Branfon: In "What Qualifies as a Slipup," it says, and I quote:
"A slip-up could be any mistake made by anyone in any situation."
Also,
"Accidental: Slip-ups must truly be mistakes that were unintended."
Yeah, this is a Slip-Up alright. :-)