If you flip the piece upside down so the writing is backwards, that's the "wrong side" of the pattern. Really, there is no "wrong side" of a pattern; if you wanted to lay the whole pattern on the fabric face down and cut it out that way, the garment would still work.
There is sometimes a wrong side of fabric - get a pair of jeans and examine the inside, and you'll understand.
The "wrong side" in knitting is the side that doesn't show the pattern. The wrong side is the one that goes inside toward your skin in the making of a garment. So if you are making a garment, look to the side that has the pattern clearly, this will be the "right side".
When a pattern refers to the "right side" of your work, they mean the side that is the front. The side that is the back will be the "wrong" side.
The front side of the fabric, where the pattern is strongest and the colors are brightest, is called the right side. The back side of the fabric, where the pattern is weaker and the colors tend to be muted, is called the wrong side. This is very important to determine before cutting out pieces of fabric because different pattern pieces will need to be placed on the right side or the wrong side to have the fabric face the correct way.
Look at the fabric. One side will be prettier than the other. That's the right side. If you are looking at stockinette knitting, where you knit one side and purl the other side, generally the knit side is the right side. Examine the stitches. On one side the stitches look like the letter "V." On the other, they look like bumps or dashes ("-"). The "V" side is the knit, or right side, and the "-" side is the purl or wrong side.
It means "wrong side". In a stocking stitch, the purl side is the wrong side.
Wrong Side of Memphis was created in 1992.
The Wrong Side of the Sky was created in 1961.
Wrong Side of the Daylight was created in 2010.
Wrong Side Up was created in 2005.
Wrong Side of the Road was created in 1981.
Usually, the pattern will tell you which is the right side. I have been crocheting for five years and I still can't tell by looking. If a pattern says something like this: Chain 51, turn SC in each CH across (RS) ...that means the row of single crochets is the right side (RS). You can put a loop of a contrasting color yarn, or a small safety pin, on the end of that row in one of the front loops. Then when you are several rows ahead you can always look to see which side your marker is on, and know that's the right side. you can tell by looking at the chain of loops that is created. if it curls towards you, this is the right side, if it curls away from you, it is the wrong side. What I do is when I do my foundation chain, I leave a tail. Then when the tail of the project is on my left, I would be on the "right" side of the piece, if the tail is on the right side, then I'm looking at the "wrong" side or back of the project. If you are chaining up and turning on every row, and unless your pattern specifies the right side differently, your odd rows will be the right side. As noted above, Row 1 of sc will be your front or right side, you turn and work Row 2 the back side, Row 3 again on the right side etc.
The Wrong Side of the Sky has 237 pages.