This is the 10729th most frequent French word.
méga
"Méga" means "mega" or "very large/great" in English.
Here, 'méga' is used as an informal intensifier to describe the concert as being extraordinarily impressive.
Ce concert était méga impressionnant.
This concert was mega impressive.
'Méga' functions here as an adverb, emphasizing the exceptional speed at which she solves problems.
Elle est méga rapide à résoudre des problèmes.
She is mega fast at solving problems.
In this sentence, 'méga' is used as an adjective to denote the large size of the pizza.