What is "bonnyclabber"

Bonnyclabber \Bon"ny*clab`ber\, n. [Ir. bainne, baine, milk + clabar mud, mire.] Coagulated sour milk; loppered milk; curdled milk; -- sometimes called simply clabber.
--B. Jonson.

1620s (in shortened form clabber), from Modern Irish bainne "milk" (from Middle Irish banne "drop," also, rarely, "milk"; cognate with Sanskrit bindu- "drop") + claba "thick." Compare Irish and Gaelic clabar "mud," which sometimes has made its way into English (Yeats, etc.).

alt. sour, soured, fermented or curdled milk; acidophilus milk. n. sour, soured, fermented or curdled milk; acidophilus milk.