The flowers men wear to dances. The male equivalent of a corsage. I know you should wear one to the Homecoming dance, but other than that I'm unsure if you should to wear it to other dances.
The boutonniere was pinned to his sport coat.
French for "Booty is near"
Barney: Robin, did you know that "Boutonniere" is French for "booty is near?"...True story.
Robin: Did you know "Barney" is French for "sad little guy who works way too hard to get laid?"