[app. a. Du. spat in the same sense. A small splash of something.

1

1876.  J. Weiss, Wit, Hum. & Shaks., ii. 47. When a skilfully distended bubble breaks, and only a thin spat of suds is left.

2

1897.  Mary Kingsley, W. Africa, 258. Spats of mud, which they [elephants] sent flying with their stamping and wallowing, came flap, flap among the bushes covering me.

3