Why does my pee start spraying everywhere at the end of urination sometimes ?

Here are some...: Spraying flow denotes insufficient flow force to pass through the last segment of urethra of about 1-1.5 cm which is figuratively coined as fossa navicularis for its shape like a slit selection of garden hose nazzle, through which the flow spray at a lower pressure. Your observation in urine flow change at its ending suggests the functional relaxation and opening are slowly impairing. More? See...