Green’s Dictionary of Slang

(Aus.) orig. surfing, men’s (board) shorts.

1997		J. Birmingham Tasmanian Babes Fiasco (1998) 211: I’d crashed out in my boardies and an old, torn-up Rolling Stone tee shirt.
2008		G. Kelly Green Room 116: He was about to go get his boardies when I stopped him. ‘No need for that. My folks aren't home so let's skinny dip’.
2012		J. Dee Afternoon Rhapsody 38: Her hand was on the front of his boardies, cupping him.
2018		G. Gilmore Base Nature [ebook] Davie [...] dragged ona rashie and a pair of boardies.