What does it mean to have cloudy urine?

Infection, bleeding: Cloudy urine is caused by small particles that block the passage of light, the most innocuous cause would be the precipitation of amorphous salts, usually phosphates, this usually happens when the urine cools prior to testing. Serious causes such as infection, or bleeding need evaluation. A urinalysis and discussion with your doctor should clear this up.

Possible infection : Bladder or kidney infections.

Many possibilities: It could be a transient occurrence from something you ate or drank, but more likely the prodrome (or telling finding) of a uti. If it does not clear up in 1-2 days, or other symptoms appear (especially back ache, headache, fever or burning on urination), it needs to be evaluated by a doctor.