noun

• (hydrodynamics) The whole system of flow in the vicinity of a source.
• (slang) An annoyingly pretentious person; a whippersnapper.
  "He was still there when I came up, a squirt with his hat over one eye and a camera hung round his neck and a grin on his squirt face. I thought maybe I had seen him around town, but maybe not, the squirts look so much alike when they grind them out of journalism school."
• (UK, Ireland, US, Australia, New Zealand, Philippines, slang) A small child.
  "Hey squirt! Where you been?"
• (slang, vulgar, uncountable) Female ejaculate.

verb

• (intransitive, of a liquid) To be thrown out, or ejected, in a rapid stream, from a narrow orifice.
  "The toothpaste squirted from the tube."
• (transitive, of a liquid) To cause to be ejected, in a rapid stream, from a narrow orifice.
  "The hard-featured miscreant[…] coolly rolled his tobacco in his cheek, and squirted the juice into the fire grate."
• (transitive, by extension) To emit, eject or excrete (something).
  "Among the hallmarks that all fungi share is the way they eat. They squirt out enzymes to break down nearby organic material and then soak it in. Fungi can also produce vast number of spores, which can survive in all sorts of extreme conditions for years."
• (transitive) To hit with a rapid stream of liquid.
  "Ask the child to squirt the target with water."