Bubblecore is an obscure music genre designed to sound bouncy and somewhat bizarre while maintaining a positive feel.
It often makes use of short, evenly placed notes accompanied by deep ambient pads.
A bubblecore beat has frequent breaks between kicks which sometimes results in brief moments of complete silence.
Generally, a bubblecore song will sound spontaneous and unpredictable, using unusual chord combinations while still keeping a strong melodic nature.
When you draw an imaginary boundary around your relationship to help strengthen it by keeping outside intrusions (like work and family) at bay, at least temporarily.
A simple example is a couple with children getting a babysitter and having a 'date night' with each other. Another could be negotiating the number of visits by your in-laws (and how much advice they give!). Keep them out of your Couple Bubble!