'dingdong' definitions:

Definition of 'dingdong'

adverb

Heartily or earnestly; "They fell to work dingdong"

verb

Go `ding dong', like a bell [syn: ding, dong, dingdong]

From: GCIDE

dingdong \ding"dong`\, ding-dong \ding-dong\, n. [See Ding.]
1. The sound of, or as of, repeated strokes on a metallic body, as a bell; a repeated and monotonous sound. [1913 Webster]
2. (Horol.) An attachment to a clock by which the quarter hours are struck upon bells of different tones.
3. a stupid or foolish person; -- used in a deprecatory or contemptuous sense. [slang]
Syn: ding-a-ling, doofus. [PJC]