Why do this? there are better nutes that will do a better job, too messy and could encourage disease/pathogens. Keep the eggs and coffee for breakfast.
Myth: Used coffee grounds are acidic.
Spent coffee grounds are not in fact acidic, because nearly all the acid is water-soluble and remains in the brewed coffee. Therefore, the true pH of coffee grounds is typically neutral, about 6.5 to 6.8, but the pH can change over time as the coffee grounds decompose.
Top dressing with coffee grounds will give your plant instant access to Nitrogen and a host of other elements. On average they contain about 2% Nitrogen....