Cussing up a storm is a metaphor .A metaphor is a figure of speech in which a word or phrase is applied to an object or action to which it is not literally applicable. In this case the person is basically using the statement to say that they are using a in excessive amount of fowl language.
I want nothing more than to settle scores you fucking whore, I'm cussing up a storm but these tear drops are vain warning ,cause your time will come ,I'm just brain storming.
Cussing somebody the fuck out :You son of a bitchyou got me fucked up talking all that bullshit you can kiss my mothafucking ass bitch you got the right one hoe you don't phase me bitch you ain't nothing but a bitch ass pussy hoe you need to grow the fuck up and stop acting like a gotdamn child you ugly ass mothafucka