expression of indifference or rejection of some suggestion or remark, 1847, from shuck (n.) in the secondary sense "something valueless" (i.e. not worth shucks, attested in a separate source from 1847).
Entries linking to shucks
shuck n.
1670s, "husk, pod, a shell," especially of a nut, a dialectal word of unknown origin. Compare shuck (v.). It was later used in reference to the shells of oysters and clams (1872). Figuratively, as a type of something worthless, by 1836.