Top Definition
An abbreviation that translates as "how fucking dare you mate". It is not an acronym, and each letter is pronounced. Accordingly, it reads "H-F-D-Y-M".

Increasingly used in Australia between friends to express disdain or amazement. Used in a tongue-in-cheek or friendly manner.

Mick: Where's my Akubra?
Bill: I lent it to Jonno.
Mick: HFDYM!
by Kieren Lee-Murphy October 02, 2006
5 Words related to hfdym

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