/ ˈdɪdəmz; NAmE / exclamation , noun
( BrE , informal )
■ exclamation
used for showing sympathy, especially in a way which is not sincere
■ noun
used when addressing sb to show sympathy, especially when you are not being sincere :
Is Diddums OK?
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WORD ORIGIN
late 19th cent.: from did 'em , i.e. did they? (tease you, do that to you, etc.).