The doctor just said I probably have bladder spasms--meaning what?

Bladder contractions. Like a muscle cramp, bladder spasms occur when the detrusor muscle of the bladder, which is responsible for squeezing and expelling urine, squeezes without permission. This can occur when there are neurologic issues, severe bladder irritation or infection, and in overactive bladder syndrome. There is usually dull discomfort and pain, with occasional urine leakage.