The specified hour of the working day designated to verbally offending your office/workplace.
Not to be used for bullying and/or attacking a boss or colleague.
Origins can be found in the book 'Suck my Naked Mole-Rat' by Laura George.
The author of the book is generally credited with the word's creation
Lucy: Hey it's 11am, you know what time it is...
Tim: Yeah, it's Vom-Hour !!!
Luke: I Saw this bird shat in the street last night, i think it must have been eating grapes or something ?!?!?
Lucy: Why grapes?
Luke: Because it tasted like grapes.
Lucy: Ewwww, It's definatly Vom-Hour !!!