happy as Larry
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happy as LarryBRITISH, INFORMAL
If you are as happy as Larry, you are very happy. I gave her a police badge to wear on her sleeve and she was as happy as Larry. Note: `Larry' may refer to the successful Australian boxer Larry Foley (1847-1917). Alternatively, `Larry' may come from `larrikin', a 19th century word for a hooligan or ruffian, used mainly in Australia.