Noah's ark
1. adjective
dark. Rhyming slang UK, 1934
2. noun
1
an informer. Rhyming slang for NARK (an informer); used in England since the first decade of the C20. 'Noah's ark' is spoonerised into 'oah's nark', which infers the deeply contemptuous 'whore's nark' UK, 1996.
2
a person who accompanies a customer but deters him or her from making a purchase. Rhyming slang for NARK (an awkward customer) UK, 1979.
3
a spoilsport. Rhyming slang for NARK AUSTRALIA, 1898.
4
a park. Rhyming slang UK, 1971