"shift quickly," 1530s, earlier "to bargain" (early 15c.), ultimately from Old English ceapian "to bargain" (see cheap); here with a sense of "changing back and forth," probably from common expressions such as to chop and change "barter." To chop logic "engage in sophistical argument" is recorded from 1570s. Related: Chopped; chopping.
adjective suffix, "full of or characterized by," from Old English -ig, from Proto-Germanic *-iga- (source also of Dutch, Danish, German -ig, Gothic -egs), from PIE -(i)ko-, adjectival suffix, cognate with elements in Greek -ikos, Latin -icus (see -ic). Originally added to nouns in Old English; used from 13c. with verbs, and by 15c. even with other adjectives (for example crispy).
<a href="https://www.etymonline.com/word/choppy">Etymology of choppy by etymonline</a>
Harper, D. (n.d.). Etymology of choppy. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/choppy