Very, super, really — the Argentine intensifier.
Stick "re" in front of almost any adjective and you have amplified it: re bueno, re caro, re cansado. Young Argentines use it constantly and can stack it ("re contra bueno"). It is the single fastest way to sound Argentine rather than neutral.
Reading a definition isn't the same as saying it to someone. Lingo Kaiava is a voice tutor set to Argentine Spanish — it uses re the way locals do, corrects you in the moment, and never "fixes" the way real people actually talk into textbook Argentine Spanish.
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