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1) When a quarterback throws an interception, especially if it is returned for a touchdown by the defense. Popularized by Jake Delhomme of the Carolina Panthers and Cleveland Browns.

2) A Dehlomme-esque moment.

Dehlomme + Moment = Dehlomment.
1) Peyton Manning just threw an interception for a touchdown. That was a Dehlomment!
by Bro.J.Simpson November 28, 2010