Taloo, paleja! (Bye bye, couple!)
We learn by imitation. This has a comical dimension in itself, and in certain cases, dimensions can multiply and become even more comical.
In the morning, an elderly gentleman and lady (quite old and quite serious in their attire and manners) were sitting on the bar’s outdoor seating. They finished their breakfast, paid the bill, got up to leave, saying goodbye, and the Chinese owner and waitress replied:
‘Taloo, paleja!’
I don’t think the expression ¡Adiós/Hasta luego, pareja! (Bye bye, couple!) be common or natural in English, and it’s not used in Spanish either, except in informal, very familiar settings, usually directed at a young couple (although they don’t necessarily have to be young, dating, or even a boy and a girl). For a relatively young waitress to say this to an older couple, even if they are regular customers, sounds like a bold move bordering on rudeness and disrespect, which, witnessed to an outside observer, is somewhere between tense and hilarious.
The couple at the Chinese bar didn’t react with offence, discomfort, or even surprise; it was clear that it was an unconsciously inappropriate reproduction of something learnt through prolonged careful observation.
Either way, the thing is that if I already find it difficult to explain to folks from outside Spain, but still (English-speaking) Westerners, the tone and context of use, and the farcical result that arises when this particular farewell is used outside its natural context — imagine trying to explain it to the Chinese woman.
So I’m afraid we’re going to witness more ¡Adió, paleja! and other similar situations in the future.