She wasn't on the Late Late. The poster was being hypothetical?
In all seriousness though, I had never heard the word "trouple" before this. "threesomes" yes, and that was more in the context of behind closed doors, no-strings stuff between three people. I remember reading an article on swingers clubs in Ireland, but again, it's all hush hush. To borrow a term of phrase from the movie "Fight Club"...."The first rule about swingers club is:you do not talk about swingers club.
Now onto the 'trouple" -a committed relationship between three people". As in, sharing all the trials and tribulations of being in a relationship: managing finances, the weekly shop, sharing the chores, home improvements, in sickness and in health etc etc and that's before we get to the number one thing in this case: the fact there are young kids involved. I call absolute bull on this. As we speak, DH is swanning around some fancy exotic resort with his girlfriend and Una is posting her usual boring home gym selfies in Thurles. This is purely a publicity stunt . I think she is just desperate to get back in the public eye and the cryptic posts from Morocco were to get people talking about her or get back at her ex. Really? Is this worth it?