yellow peril
noun
1
a danger (real or imagined) that armies of any and all Asiatic peoples will overrun the West. From the conventional use of 'yellow' to convey an Asiatic or Oriental complexion. Usage is mainly historical but paranoia and the Internet keeps the phrase alive UK, 1900.
2
used as a collective noun for all sorts of things with a yellow connection. Mainly jocular. Used by motorcyclists of traffic wardens (from the yellow flashes on their uniforms) UK, 1943.
3
hepatitis. A peril of shared needles by drug addicts; their usage, with a pun on the fear of Asians and the skin discolouration associated with hepatitis UK, 1985.
4
in prison, school, or any canteen in any institution, a bright yellow cake favoured by the caterers. Originally services UK, 1961
Yellow Peril
nickname in Canadian military aviation, the Harvard training aircraft
CANADA, 1995