TracyKM made an excellent comment on my recent post about ribbing... she mentions that she ran into a similar issue with SSK...
The pattern she was working with defined the SSK decrease as "slip, slip, knit". So she slipped a stitch, slipped a second stitch, and then knitted a third.
(Which is, by the way, absolutely not the way it's done. Not even close. If you're not familiar with SSK, go here now.)
I see this reasonably often, and it can get a knitter into serious trouble... after all, not only is that NOT a decrease, but it also uses up one more stitch than it should, and it can completely screw up with your stitch count.
I regularly get asked what SSK stands for, and after years of teaching knitting, I have simply stopped spelling the abbreviation out. I respond with a definition: "it's a left leaning decrease", if I'm feeling theoretical, or, if I'm feeling effusive, "it's a k2tog but you twist the stitches first".
Invariably, someone in the room pipes up and says "slip, slip, knit". I try to make a little joke out of it, and explain why it's so horribly wrong.
I mean, technically, it stands for "slip, slip, knit the 2 stitches together through the back loop", but it so rarely gets spelled out that way. Yeah, sure, if you know what you're doing, then "slip, slip, knit" conveys it - but after all, aren't instructions like these for people who don't know what they are doing??
I really do need to come up with a catchy alternative explanation - in the meantime, I will simply continue to refer to SSK as a candidate for the most misleading abbreviation ever, and hope that knitters remember how to work it.