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Boom Bop (the full quote being "Boom Bam Bap Bada Bap Bop Pow") refers to a quote from the 2011 YouTube viral video "The Rap Battle [Parody]" featuring Supa Hot Fire. Starting in May 2017, the quote has been used as a sound effect in videos as well as a catchprase in image macros.
On May 25th, 2011, Supa Hot Fire posted a parody video titled "The Rap Battle [Parody]", which lampoons the highly confrontational aspects of rap battles (reupload shown below). The character Supa Hot Fire ends the rap battle with the quote shortly after saying another notable phrase from the video, "I'm about to end this man's whole career." It is met with celebratory cheering from spectators.
The meme began to appear as an image macro (seen below) in 2012. It was uploaded in to Know Your Meme by user Brad. It later appeared on Twitter throughout 2013 and led to a number of other memes using the same quote.