Etymology
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scads (n.)

"large amounts," 1869, American English, earlier "a dollar" (1855, usually in plural), a word of uncertain origin. Unknown connection to scad, the fish, which, along the British coasts, were often very abundant and occasionally seen in immense shoals.

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Definitions of scads

scads (n.)
a large number or amount;
Synonyms: tons / dozens / heaps / lots / piles / scores / stacks / loads / rafts / slews / wads / oodles / gobs / lashings
From wordnet.princeton.edu