When you find a crusty used tampon under your bed and you recall that night a girl asked you to go down on her but didn't warn you that she was on her period. Only way you realized it was when you went to the bathroom and looked in the mirror to a red mouth.
I was moving today and found a raspberry hollipop underneath my bed!
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.