stubbornness, peskiness 

Ang kulit niya!
He/She just keeps nagging me, bothering me.




If someone keeps asking you for something, even though you've already said no, then you can tell the person:


Makulit ka talaga!
You're really such a pain in the ass. 


Nakakainis ang kakulitan nila.
Their nagging is so irritating.


The Tagalog word makulit is often used in a light-hearted context to describe someone who is annoying in being repetitive or stubborn or unflagging in their asking questions or asking for a favor. 


Kinulit nila ako hanggang sa umoo ako.
They just kept nagging at me until I said yes.