Whistle and Flute noun Whistle and Flute in Cockney rhyming slang means: suit Whistle and Flute is mainly used as: whistle EXAMPLE USE ❝ He’s wearing his best Whistle for the interview.❞ Other London Cockney accents about Clothing Weasel and Stoat Tony Blairs Almond Rocks Ascot Races Daisy Roots