The term refers to the habit that some men had of flicking their wrists in order to show the cuffs
of their sleeves, and the cufflinks. The phrase goes
back to the days when celluloid collars and cuffs
were the salesman's answer to the laundry problem
when on the road. With
the high-buttoned jackets of the period, the collar and cuffs
were all that showed, and since celluloid could be wiped clean with
a damp cloth, a shirt
could be made to last a week.
would like to ostentationsly show their cuffs
in a sudden and showy way.
It is also
called "to shoot one's linen" in an unnecessary display of shirt