hfdym 

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!

hfdym by Kieren Lee-Murphy October 3, 2006

HFDY 

How Fucking Dare You.

Bro1: I deactivated the Netflix account, you'll have to get your own.
Bro2: HFDY

HFDY by philip brosman September 4, 2014

HFDYSI 

How Fucking Dumb Your Shit Is. 'nuff said.

omg, my fucking God, HFDYSI !!!!!!!!!!!!

HFDYSI by badspy vgybhu June 9, 2024