What does this sentence say Geniet die dag en kry leker vrot?

That's Afrikaans. The sentence "Geniet die dag en kry lekker vrot" translates roughly to:

"Enjoy the day and have some fun/a good time."

"Lekker vrot" is a colloquial and slightly informal expression. "Lekker" means nice or good, and "vrot" literally means rotten, but in this context it's used playfully to mean a good time or a bit of mischief, similar to "a blast" or "a riot" in English.