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"one who is crazy," 1935, from notion of hearing bells in the head (see ding (v.)).
: to maintain the dingaling Holly Goheavily manner of life/ It's the ding-a-ling capital of the universe (1930s+)
An eccentric person; nut, screwball: The impression left by all this is that Wolman and Kuharich must be a couple of ding-a-lings/ great for teeny-boppers and cute little ding-a-lings (1930s+)
[fr the notion that such a person hears bells ringing in the head]
The penis; cock, doodle
[1980s+; probably fr dingus]