1. To eject, flow, or issue forth (from some source) in one or more forceful spurts. The doctor pulled back the bandage and blood started squirting out. Water squirted out of the small puncture in the pipe.

2. To cause or force some liquid to eject, flow, or issue forth (from some source) in one or more forceful spurts. In this usage, a noun or pronoun can be used between "squirt" and "out." He took out the bottle from the fridge and squirted out some ketchup onto his burger. You can fill the water gun in the kitchen sink, but don't squirt any out in the house or I'll take it away!