Sunday but on Thursday, make sure you are thirsty
Ohhhh on thursday, baby get ready ohhh on Thursday
Woaahoooh hold it ohh on Thursday, just wait on Thursday, baby only Thursday

from The Weeknd – Thursday Lyrics on Rap Genius

Meaning

When Thursday comes be thirsty for me, be ready, this is the day when it all goes down, it’s worth waiting for.

He definitely does say “ get ready ” but it kinda sounds like “ get reedy ”(Greedy). Greedy as in, for his attention.

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