How much is a "splash" I've run into several recipes which asked for a "splash of" water, soy sauce, etc.  How much is a "splash"?  I assume if it's something more concrete like 1/4 cup, they would have said so.  Since it's a "splash", I just poured some (1/2 a cup) water into a coffee cup and poured once around the pan, although, my control isn't that good so I probably ended up pouring 1/4-1/3 of a cup.

Everything still tasted ok but I'm just curious what a "splash" is.
I would measure a splash by the second - that is, holding the container (usually bottle) about a foot above the pan, and pour about a second or two's worth of liquid.  Or to put it another way, stop pouring about when the stream of liquid hits the pan and consider that mid-air-stream a (medium) "splash".  

I would usually get a couple tablespoons of liquid pouring this way.  Of course, stronger liquids usually come in smaller mouthed bottles so less gets poured - for soy sauce, I'd get a few teaspoons, for water (from a cup) a few tablespoons, for something like liquid smoke - a few drops since the bottle's opening is very small.

More generally speaking, I've always considered "splash", "dash", "sprinkle" and other such measurements to be an equivalent for, like oft cited for salt and pepper, "to taste".  Or perhaps "to texture", depending on the what-where-when that's being added.  The recipe doesn't have a measurement because it isn't recipe-critical how much is actually added, it's just to the preference of whoever is cooking.