Given the paragraph, what is the term budgie smuggler colloquially use to describe?

A swim brief or racing brief is any briefs-style male swimsuit such as those worn in competitive swimming, diving and water polo. The popularity of the Australian Speedo brand racing brief has led to the use of its name in many countries around the world to refer to any racing brief, regardless of the maker.[1] Occasionally, the speedo genericized trademark is applied to square cut swimsuits,[citation needed] but in general the generic term is used in reference to swimming briefs. Swim briefs are also referred to as competition briefs, swimming trunks, bathers, togs, racer bathers, posing briefs, racing briefs, and colloquially in Australia, New Zealand, and the United Kingdom as "budgie smugglers".[2]

Like underwear briefs, swim briefs feature a triangular shaped front and a solid back providing form-fitting coverage. They typically are worn below the lower waist. They are generally secured by thin banding at the upper thighs, and a drawstring around the waist and/or an elastic waistband. Swim briefs are often made of a nylon and spandex (Lycra) composite, while some longer-lasting suits are made from polyester and still others from other materials. Most swim briefs have a beige or white front lining made of a similar fabric.

In Australia, New Zealand and United Kingdom a "budgie smuggler" is used to describe a swimming brief