Definitions by Rokeby

HDBU 

Stands for Head Down Bum Up (or Heads Down Bums Up, when referring to a group).

Meaning: busy at work; hard at work; engrossed in something to the exclusion of other distractions – presumably by analogy to livestock feeding at a trough?

Synonyms: Heads-down; up against it; having one's nose to the grindstone.

Origin: unknown, apparently Australian.

HF: Is everyone coming downstairs for the team meeting?
SR: Sorry, going to have to give this one a pass. I'm HDBU on a BB DG that's due by EOP.

HDBU by Rokeby July 23, 2020