Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Having flat sides.
- adj. Informal Tall and slim; lanky.
Century Dictionary and Cyclopedia
- Having flat sides like slabs; hence, tall and lank. Also slap-sided.
Wiktionary
GNU Webster's 1913
- adj. Colloq. U. S. Having flat sides; hence, tall, or long and lank.
Examples
“As the does got nervous, I looked behind the buck in the brush and 10 yards back there stood a buck whose slab-sided body made the 3x4 look like a yearling!”
“There is a wonderful photo of a kid holding a slab-sided black crappie bigger than his face.”
“Buncan blinked at the heavy horse, trying to see into the slab-sided, tarp-covered wagon.”
“His men tugged the weary animals along behind him, through the gap under the arch and along an almost interminable, smelly maze of alleys whose sides were the walls of square stone towers, or sometimes of mud-and-stone-walled compounds, and here and there of sheer, slab-sided cliff.”
“Besides a competitive price, the Suzuki has distinctive sheetmetal: The arcs and swoops on the side view are better looking than slab-sided competitors.”
“This morning in the studio he's drawing on his luxury-car background to help his designers craft a pickup that doesn't have, as one puts it, "that slab-sided Hummer look.”
“The slab-sided plastic-body-paneled exterior is gone, replaced with something much more stylish.”
“The new model forsakes the plain, slab-sided look of previous Accords, like the 2007 model (top).”
“The new model forsakes the plain, slab-sided look of previous Accords in favor of deeply creased flanks, large wraparound taillights and pronounced headlights that bulge outward instead of fitting flush with the front end.”
“But the U.S. Army Air Force acquired its planes in matched sets, and the alternative "heavy" -- competing for use with the B-17 -- was a high-wing, slab-sided, twin-tailed flivver built primarily by the Ford Motor Co.: the B-24 Liberator.”
Lists
These user-created lists contain the word ‘slab-sided’.
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Wordie/Wordnik Curio Cabinet
Oddments culled from my "main" lists that belong in a display cabinet of their own, plus sundry other curiosities. :-)
zeugma, ziggurat, xiphoid, xeric, whizgigging, whangdoodle, viviparous, vivific, vinolent, verjuice, vellicate, velleity and 1193 more...
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Oofy
States of being
seeress, honey bucket, donkeyman, poopyhead, halfwit, vixenish, galoot, hoity toity, shitkicker, miserabilist, wanker, clueless and 261 more...
Tweets
Looking for tweets for slab-sided.

testudoaubreii Slab-sided is a favourite term of Patrick O' Brian, mercurial author of the Aubrey/Maturin series. He employs it regularly to describe an obstinate, slow-witted sailor or an unwieldy and cumbersome vessel. Dec 7, 2008
yarb Her captain was a slab-sided Quaker, in a suit of brown, with a broad-brimmed hat, bending his long legs as he moved about decks, with his head down, like a sheep, and the men looked more like fishermen and farmers than they did like sailors.
- Richard Henry Dana Jr., Two Years Before the Mast, ch. 25 Sep 9, 2008