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An "esteamed colleague" is one who has become excessively, comically irate. A pun on "esteemed" and "steamed".
The guy over there ranting about how Liberals have turned America into a festering cesspool of Godless immorality is my esteamed colleage Richard Mongler.

Art thou esteamed, my good sir and/or madam?
by Mooninaut March 01, 2013