Definition of "speedos"

For example, board riders paid more attention to appearances (short hair v long hair, speedos v board shorts) and conspicuous behavior (surfing for training rather than for fun or to express oneself), than life savers.

1979, Kent Pearson, Surfing Subcultures of Australia and New Zealand, University of Queensland Press, page 118

I remember my mother standing exasperated in the rain with the brolly over her head at dusk while I frog-kicked around in my speedos.

2000 July, Ian Jack (editor), Granta, Issue 70: Australia: The New New World, page 42

Their club is Manly, and this word is emblazoned across the back of their speedos.

2006, Margaret Henderson, Marking Feminist Times: Remembering the Longest Revolution in Australia, page 212