Dead Bang

In law enforcement and ballistics, "dead bang" refers to a situation where an individual is caught red-handed in the act of committing a crime, or where evidence definitively links a suspect to a crime with no reasonable doubt. The term implies a high degree of certainty and conclusive proof. It's akin to saying the case is "slam dunk" or "open and shut." The evidence is so strong and the circumstances so clear that a conviction is virtually guaranteed.

The term can also be used more generally to describe any situation where the outcome is a foregone conclusion due to overwhelming odds or undeniable proof. For example, one might say "He was dead bang to fail the exam after skipping every class."