When you are talking on AIM and either you or your buddy uses sarcasm, but it is difficult to tell if they're being sarcastic or not due to the nuances of the spoken language.
L-Money: So I take it you're real busy right now.
M-Dawg: Is that AIMcasm, or are you serious?
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"