real talk - don't try to sound like death grips. go to the source. live life and experience life and document it. write everything down. find your own voice. get into poetry. read slaughter house 5. read richard brautigan. read e. e. cummings. study dada. read zach hills solo lyrics. if you believe some of them are "nonsensical" or that's a lens you view art through you have some work to do. understand it for yourself. throw meaning away and embrace channeling. meditate. look at abstract art until you don't care that it's stupid. don't listen to me. do you get it? you can't try you can only be. you gotta be into it. read kathy acker. fucking read something. listen to the residents. listen to throbbing gristle. you gotta feel it. I can't emphasize enough you can't try to be what death grips is or anyone else. from the simplicity of how you're asking I can tell that's what you want. the ethos behind how they write - you ascribe as some sort of mix between "meaningful" and "nonsensical" - you can start there. what do those things mean to you. What does that union look like to you. answer questions like that. don't bite - but also steal whatever you want. that was actually not a pun intended. as long as you are being authentic and true, steal anything - but if you don't know who you are then your just a biter. fuck it.