This is the 3630th most frequent Polish word.
fest
"Fest" in Polish means "very" or "really" and is used to emphasize something, often in informal speech.
In this sentence, 'fest' is used colloquially to mean very good or excellent.
Ten koncert był naprawdę fest.
That concert was really great.
Here, 'fest' emphasizes the magnitude of 'luck,' implying it was exceptionally strong luck.
Miał fest szczęście w tej grze.
He had great luck in this game.
'Fest' in this context is used to intensify the adjective 'tough,' indicating a high degree of difficulty.