One of the mysteries of the English language finally explained.
The technique of applying scent to a surface in such a way that it is released when scratched. Frequently attributive: designating something which has or involves scent which is released when scratched. [A trademark in the United States.]
1960s; earliest use found in Tri-City Herald (Washington). From scratch + and + sniff.
scratch and sniff/ˌskratʃ(ə)n(d)ˈsnɪf/
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