1871. De Vere, Americanisms, s.v. Moke, possibly a remnant of the
obsolete moky, which is related to ‘murky,’ is used in New York to
designate an old fogy or any old person, disrespectfully spoken to.
1871. Galveston News, 4 May. See here, my lively moke, said he, you
sling on too much style.