OMHD 

'Oh My Heavenly Days'

An expression of shock/disbelief/horror/surprise/happiness.

Often used by the character Bree Van de Kamp in Desperate Housewives. Variant of OMG.

'OMHD, there are giant mutant ants trying to crawl through my window! What should I do?'

or

'OMHD, my dad embarassed me so much today. I thought I was gonna die.'

OMHD by blkk100 August 21, 2009

OMHD 

OMHD goes for 'Oh My Holy DAGames'.

OMHD, THANK YOU SO MUCH!!!

OMHD by KJ7OCHVARD September 29, 2019

OMHDB 

"Oh My Holy Disco Ball!"

People who like discoballs or have discoball fetishes prefer using OMHDB over OMG, OMFG etc.

"So at their Wacken gig, Turisas played Rasputin and everyone went crazy!"
"They did?! OMHDB!!!"

OMHDB by Smashingdude September 16, 2009

OMHDD

abbv. Oh my hard disk drive

OMHDD, you didnt just install windows 95

OMHDD by pwnage6654 November 14, 2009