Whenever I see Dato in a profile, I always assumed it means unlimited oral access for the client on the provider, but you know what they say about assuming.
But if you need it to be an acronym, I think the least confusing would be "DATO"
Because it parallels DATY, it should be clear that it involves the guy on you.
More confusing
TUMA (who is "me/my", the client or provider?)
TUHA (is the "H" for "His" or "Her"?)
Rimming (who is the recipient?)