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!
squirt out(of someone or something)
[for something, especially a liquid] to gush or spurt forth from someone or something. In the horror movie, black stuff squirted out of this guy whenever he got angry. A lot of blood squirted out of the gash and I closed my eyes.