Boom bap means: A style/subgenre of hip hop characterized by hard-hitting drums, usually containing the kick drum/snare drum/hi-hat combination rather than claps, snaps, TR-808 bass drums, cowbells, shakers, and. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.