This apparently indicates his guilt, and the pilot labels him a “squirter.”
mid-15c., squyrten "eject water in a jet," of uncertain origin, probably imitative. Related: Squirted; squirting.
mid-15c., originally "diarrhea," from squirt (v.). Meaning "a whipper-snapper" is from 1839.
A crazy or eccentric person; nut, squirrel: I'm afraid the old mentor is squirrel-food by now
[first form 1919+, second 1915+; fr the fact that squirrels eat nuts]