This is the 8809th most frequent Spanish word.
súper
"Súper" in Spanish means "super" or "great," and can also refer to a "supermarket" (colloquially).
In this sentence, 'súper' is used as an adverb to intensify the adjective 'interesante', meaning 'very' or 'extremely'.
Tu idea fue súper interesante.
Your idea was super interesting.
Here, 'súper' stands for 'supermercado', meaning 'supermarket', which is a colloquial shorthand term in Spanish.
Vamos al súper a comprar pan.
Let's go to the supermarket to buy bread.
In this example, 'súper' modifies the adjective 'rápido' to emphasize the high degree of speed, acting as an intensifier meaning 'very' or 'extremely'.