1. referring to the actual, plastic dull knife
2. a uselesstrick/weapon against something more powerful/clever trick
Ex 1.
"Is that a plastic dull knife? why are you borrowing it here?"
Ex 2.
Generic Hero: "I WILL SMITE YOU WITH MY SWORD."
Villain: "YOU PULL A PLASTIC D U L L KNIFE TO MY TRICKERY!!!"
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"