clabber

Dictionary: clab·ber   (klăb'ər)

Sour, curdled milk. Also called thick milk.

To curdle.

[Short for BONNYCLABBER.]

A popular dish of the Old South, clabber is unpasteurized milk that has soured and thickened naturally. Depending on its thickness, icy-cold clabbered milk was (and sometimes still is) enjoyed as a drink. It may also be eaten with fruit, or topped with black pepper and cream or simply sprinkled with sugar.

The noun has one meaning:

Meaning #1: raw milk that has soured and thickened

The verb clabber has one meaning:

Meaning #1: turn into curds,as of dairy products
  Synonyms: curdle, clot