Entry 1 sense Webster, 1913 Bonnyclabber /(-klăb`bẽr)/ · Bon·ny·clab·ber · IPA 01 n. Coagulated sour milk; loppered milk; curdled milk; -- sometimes called simply clabber. 1. Coagulated sour milk; loppered milk; curdled milk; -- sometimes called simply clabber. Also: clabber