1560s, "easily crumbled;" 1570s, "like bread," from crumb. The second sense probably accounts for 18c. (and later in dialects) use, of a woman, "attractively plump, full-figured, buxom." Slang meaning "shoddy, filthy, inferior, poorly made" in use by 1859, probably is from
mod. lousy; bad; inferior. (See comments at crumb.) : You know, this stuff is pretty crummy.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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