What does it mean to have high resting pulse rate?

Variety of things: An elevated resting heart rate could be due to something as simple as being out of shape or it could be a reflection of a serious medical condition such as hyperthyroidism. With a history, physical examination, and simple testing, your physician should be able to determine the reason for your elevated resting heart rate.

Heart beating fast: A high resting pulse rate means that your pulse (or heart rate) at rest is faster than normal ... This could be due to a variety of reasons and should be evaluated by your doctor if very high, e.g. >100 ...