@Osamu: Ah, I see. Yes, I guess you are correct, a broader description would be better. I will try to create a new suggestion, but for 'a2m' as that only means one thing whereas "atm" can mean a lot of different things.
@Aelther yes, also fingers, literally any object that could've been used. The idea is to just get the excitement from someone putting their mouth/tongue on something that is either dirty or would be considered dirty because it came in contact with the anus. I know ATM sounds like the cash machine, but based on the site it would be extremely hard to think it's about a cash machine lol. I mean, it wouldn't be the only tag where not everybody knows what it means, but a quick Google/ChatGPT search would be all that's needed. That is if most people think it might be confused with "rimjob"
Yes, I've seen people confuse the tag on several boorus. Maybe a2m? To me, "atm" just sounds like a cash machine. What other actions could it include Osamu? Do you mean like dildos and buttplugs?