four on the floor

Four on the floor is an idiom used to describe a steady, uniformly accented beat that has a 4/4 time signature as a literal slang term for a kick drum pattern played in quarter beats of a bar. It is an idiom only used in music, typically for drummers or guitarists which will recognize this figure of speech. You may not recognize the phrase if you are not a musician since it isnt commonly spoken in general, everyday conversation.