catch up soon
Ever bump into a former acquaintance that you haven't seen in a long time, and have no interest nor intention of seeing again, but have to small talk for awhile out of courtesy? They're probably thinking the same. These three words in sequence form the unicorn you sought for in your puddle of vocabulary; this is how you end that conversation.
Sarah is doing her weekly grocery trip at Walmart until she bumped into her manager Abdul from her old job.
Abdul: Oh... hey Sarah, how's it going?
Sarah: Oh... hi Abdul, how's it going? We should, uh, Catch Up Soon™!!
If Abdul is on the same frequency as Sarah, Abdul will recognize it's time to cut the small talk short and bounce and reply:
Great! Catch Up Soon™.
Ideally, they go about their day and never cross paths again.
Abdul: Oh... hey Sarah, how's it going?
Sarah: Oh... hi Abdul, how's it going? We should, uh, Catch Up Soon™!!
If Abdul is on the same frequency as Sarah, Abdul will recognize it's time to cut the small talk short and bounce and reply:
Great! Catch Up Soon™.
Ideally, they go about their day and never cross paths again.