Surefire

Great brand of tactical flashlights, often featured on CSI and used by the armed forces in Iraq.

My surefire is bright as hell and indestructible.

by Ze German November 4, 2007

Surefire

Surefire, most commonly used as "Surefire Way" is a word with similar meanings to efficient, or effective, although can have a negative connotation as well as a positive one.

"That's a surefire way to get caught."

by CoolCrafter February 14, 2021