[klab-er]South Midland and Southern U.S.
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verb (used without object)
  1. (of milk) to curdle; to become thick in souring.
Also clobber.

Origin of clabber

1625–35; < Irish clabar short for bainne clabair bonnyclabber

Regional variation note

Clabber has many regional variations, including bonnyclabber and its variant bonnyclapper in the Northern and Midland U.S., thick milk in the Hudson River Valley and North Midland U.S., lobber and its variant lobbered milk in the Inland North, clobber in the South Midland and Southern U.S., and crud in some widely scattered areas. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for clabber

Historical Examples of clabber

Word Origin and History for clabber

"mud," 1824, from Irish and Gaelic clabar "mud." Also often short for bonnyclabber.

Online Etymology Dictionary, © 2010 Douglas Harper