Hard balls of fluff (and other matter) that gather on a hairy arse that are very difficult to remove. Usually used to describe an annoying person that hangs around and won't go away.
A group of legends from Limerick City who produced some fantastic videos such as 'I wouldn't ride you without a bag of glue' and the recent 'Horse Outside' which in this author's opinion is the greatest work of genius ever to be produced on the Emerald Isle. f*ck your Honda Civic I've a Horse Outside.