The Irish version of what Americans call "bad boys," usually good-looking, virile young men who have a (real or imaginary) way with the ladies, and try to use their charm and boldness to get around all four bases in as short a time as possible.
"You watch your self around that Michael O'Shea. He's quite a bold boy, you know. He'll try to have your knickers off by the time your starters are served."
by Bill_Shakespeare June 4, 2014