"to make a gentle ringing sound," late 14c., possibly a frequentative form of tinken "to ring, jingle," perhaps of imitative origin. Meaning "to urinate" is recorded from 1960, from childish talk. Related: Tinkled; tinkling.
A petty but flashy gambler, or any person with those characteristics: denunciations of punks, tin-horns, and gyps
[entry form 1857+, variant 1885+; fr the horn-shaped metal can used by chuck-a-luck operators for shaking the dice; the notion of inferiority comes fr the presumed superiority of other, more sophisticated kinds of gambling, and fr the generalized inferiority of tin to other metals]