The Bowie knife has a large clip-point blade and a riveted brown handle. Small contact marks mar the edge, and streaks of what appears to be blood can be seen running across the sides of the blade and the hilt. The blade is stamped with the serial number 02280.
The Bowie knife is a knife popularized by Colonel James Bowie in the early 19th century.
Giving someone a "dirt-nap" (the knife's special V.A.T.S. attack) is common mobster slang for killing someone, similar to "sleeping with the fishes". The term "dirt-nap" is used many times by Set in the original Fallout.