Verb meaning to make something dull or uninviting sound interesting, like when talking to children. Teachers also diagnamate a lot.

Usually shown with exclamation marks in the written word.
Mother: "We're going to Grandma's house!! Isn't it so exciting?!?!"
Son: "Don't diagnamate, Grandma's house is boring."

Geology teacher: "Look at this amazing piece of granite!! Can you see how it has formed -really- slowly?!?!"
Student: "Sir's diagnamating again."
by teal_dream June 06, 2011

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