I think there is inherently a 'psychological' element for any film image to be effectively emetic.
Once whilst bored and looking for such things as you allude to on Youtube, I came across selected 'juicy' bits of a 90s Japanese thing called 'Naked Blood', about people driven into a drug-trial induced, sexually-charged auto-anthropophagous mania. The one image I couldn't get out of my mind for days afterwarRAB was a young lady banqueting on various bits of herself; specifically, her dessert - stabbing herself in the eye with her fork, and then proceeding to masticate upon and ingest it - all in lingering, technicolour close-up detail.
Anybody can rip pig intestines out of a stage cadaver and throw them around the screen and the like. The 'gross' effectiveness of seeing something like that however was down not only to the special effects and the extent to which the detail of the event was depicted, revelled in and lingered upon; but also the fact that it was so relatable to - we all have eyes, and we're inherently squeamish about how soft and violable they are. Likewise, her beef curtain and nipple-chomping didn't have the same effect as, not being a lady, it didn't really 'connect' that much with me.