In the song's refrain, there's another example of a common verb used in a secondary sense.

Si dos ya no se llevan bien

If two don't get along [well]

Caption 11, Jeremías - Uno y uno igual a tres

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The first definition you'll probably learn for the common verb llevar is "to carry." Learn the nuances of this versatile verb and you'll find this construction:

Llevarse bien/mal con alguien
"To get on well/badly with somebody"

For more examples -- and more nuances of llevar -- you could check out:
ThoughtCo. > Spanish language > Using llevar

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