A squirter typically refers to a device or person that sprays or shoots out liquid forcefully, similar to a water gun or a device used for cleaning. Full definition
Sodium - filled exhaust valves and piston oil squirters helped keep the new engine ticking, and bigger intake valves and more aggressive timing and lift helped it breathe. (automobilemag.com)
I've had a water squirter from 2003 that I recently put a picture of on Instagram (fruitoftheforest.com)
They appear to be your traditional bath squirters but, they screw apart so you can clean them! (theclothdiaperwhisperer.com)