Total and permanently disabled. When I was rated by the VA my overall rating was 260% disability -but of course they only pay you 100%. 100% T&P means one never needs to go back to the VA (as most do year after year) and get re-evaluations done on your disability to see if they still pay you for that disability. Example-they May rate you at 20% for an issue but if you don’t continue to see a doctor for that issue after you leave the service-and you are taking no meds-and if you seem to have zero limitations from that issue - that may take that rating down to zero.
I am fortunate. I’m still able to get around ok and am pursuing a legal career post military career. I already had a PhD but never used my post 9-11 GI Bill and now with the VA rating my kids college is actually paid for as well and they don’t have to use it-so I am. Many 100%T&P aren’t as lucky.