"a slip of wood," 1723, a Kentish word, of unknown origin. Originally a piece of iron fitted to a plow for scraping soil; meaning "thin slip to fill up a space or raise a level" is from 1860. The verb meaning "to wedge up a surface by means of a shim" is attested from 1937.
A person not appreciative of rock and roll; clyde(1950s+ Rock and roll)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D. Copyright (C) 2007 by HarperCollins Publishers. Cite This Source
shim in Technology
jargon, memory management A small piece of data inserted in order to achieve a desired memory alignment or other addressing property. For example, the PDP-11Unixlinker, in split I&D (instructions and data) mode, inserts a two-byte shim at location 0 in data space so that no data object will have an address of 0 (and be confused with the C null pointer). See also loose bytes. [Jargon File] (1994-12-21)