The inability to raise, lower, turn, and/or control your own head due to weak, injured, or insufficient neck muscle
Since she was notoriously clumsy, she tended to avoid newborns during their floppy head disease stage. It was really in everyone's best interest.
After being slammed to the ground repeatedly during the women's tackle football game, when she couldn't pick her own head up off of the pillow, she realized with a sinking feeling that she had adult onset floppy head disease.
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"