Twitter gives me this translation:
Was just to resolve ever wall drill holes want to be but never graced posters and pasted on the wall clip in on ur wall, best use of posters in a clip and magnet
I would guess that where “masturbation stone” came from wasn’t “磁石” but “マステ” (masute), which is short for “masking tape” and is close to “マス” (masu), slang for masturbation.
