1 definition by Mr.Lex Luther
History of term: This refers to a toy gun for children that can be loaded with little white powder caps that create a bang sound and small amount of smoke when the trigger is pulled. The word "cap" in the term is derived from the name Capulets . one of the fueding families in the shakesperean drama Romeo and juliet. when used in the term "bust a cap" it is also refering to the theatrical and seemingly gang related interpretation of the play by high school level students.
"Bust a cap on that fool"
by Mr.Lex Luther March 2, 2017