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A term used by people when they reverse songs and listen for secret messages.
Songs such as:
-stairway to heaven
-another one bites the dust
-my name is
-oops I did it again

and more
When you play Oops I did it again backward in a part it's going to say "sleep with me I'm not too young"
by Ultra Pulse July 22, 2005
1. A reverse playing of a song or video
2. Often used to endorse subliminal messages
Some death metal songs tell about a venture to hell in its backmasking.
by JSizmo January 10, 2009