Someone so tremendously fucking stupid, they could be classified as Sub-Doorknob in intelligence. Specially used when someone still cannot use "Their", "They're and "There".
P1: Hey, I think that's they're wallet, you should give it back
P2: In the least amount of respect possible, you're a fucking knobhead.
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 manwill 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"