When you are too bored to do left to right, up to down, or backwards, so you skipped a letter each time, only to realize that you had to stop at W since there were no more spaces, and instead made a line for all the letters you skipped.
John: have you tried qwerty?
Joe: yeah.
John: how about the other types?
Joe: yeah.
John: why not pmonibuvyctxrzeawqsdfghjkl?
Joe: yeah sounds good.
Someone or something that bites your ankles.
To a postman, an ankle biter is often known as a dog.
To an adult, an ankle biter may be a toddler.
To hikers, an ankle biter is sometimes a tick.
And so on.