Someone who tries to subdivide an angle into π parts using only a pair of compasses and an unmarked ruler.
Just as the trisectors of yesteryear tried to prove the impossible, pisectors are hell-bent to achieving their goal, hoping that their proofs would bring them mathematical fame or immortality—when being dubbed a “mathematical crank” feels less bitter than being a nobody or fading in obscurity.
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.
When a man will search for hours to find something that is laying out in the open on a table. Items are often easily found by a women.
Man: "I have been searching for hours for keys."
Woman: "You mean the ones sitting there on the coffee table?"
Man: "Where?"
Woman: "Right there in the middle of that table."
Man: "oh, must have been Male Pattern Blindness"