Office Coffee is any type of alcohol, but usually as liquor added to coffee, that is consumed while in the office and on the clock. Like it's sister term, "Road Soda," Office Coffee is generally illegal in most states and may constitute grounds for corrective action/termination/legal action.
I like whiskey in my Office Coffee - especially on Mondays.
Generic term justifying terrible-tasting coffee. Common flavor characteristics include: Burnt, Diluted, Stale, Muddy-water etc.
"Who put Bertha in charge of making the coffee in the morning? It tastes like swamp water."
"What do you expect? It's just Office Coffee."