Is a person of low intellect, often a Fairweather rugby fan. Mainly subsists on a diet of Murphy's stout a sort of poor man's Guinness and turnips. It can be found at rugby grounds but only if his team is guaranteed to win and the weather is good.
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.