What does a lot of bacteria in the urine mean?

It might be infectio. Sometimes it is due to infection in the urinary bladder but it can also be due to poor urine sample collection. If you have any bladder symptoms like burning on urination or frequent urination, then you might have infection in the bladder. If you have no urinary symptoms, then simply repeat your urine test with a proper clean catch urine collection and get a urinalysis done one more time .