Top Definition
Somebody (often immature, a suck-up to a higher power,a square, or a hyprcrite) who 'tells-on' or 'squeals' on other people for doing something considered 'not right' or 'forbidden'.

'Dibber Dobber' is not an endearing term, and these people are often disliked by others.
Thomas: "Are you guys supposed to be on facebook at work?"
Catherine: "Well, not really but we're only having a quick look"
Thomas: "Well, i'm telling the boss..."
Catherine: "Dibber Dobber!"
by Ramblez July 29, 2011
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