cuss · verb, noun1
An American English variant of curse; for a similar phonetic development, compare ass (“buttocks”), from arse, in which the r was originally pronounced (as in curse). Etymology 1, noun sense 3 (“fellow, person”) is from the replacement of a derogatory or affectionate curse word like bitch in son of a bitch with the word cuss, after etymology 1, noun sense 2 (“curse word”).
cuss · noun2
Clipping of customer.
Etymology from Wiktionary, CC BY-SA 4.0.