I think he means that he is very close to her. That he is comfortable around her and feels like he knows her very well.
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That he thinks of her as a sister, as if they really were siblings. Usually means he has no romantic interest in the girl.
Uce is a slang term for "uso" which means brother (or sister depending on who is saying the word, and who they're saying it to) If a girl says "uso" she can ONLY direct it at another girl (sister). If a girl needs to address her brother she would call him her "tuagane". If a boy says "uso" he can ONLY direct it at another boy (brother). If a boy needs to address his sister he would call her his "tuafafine".
If it's a boy: Nephew If it's a girl: Niece
It means You are Just Friends. Unless YOu want it To mean more.
If it is a boy then it is your nephew. If it is a girl then it is your niece.
Potchi is a girl ''not a boy'' because Bunny and Candy and others call her a boy they don't know if potchi is a boy or a girl they just call her a boy, not even Debphiliman can tell potchi's gender he also say that potchi is a boy, potchi is a girl, my big sister also says that potchi is a girl.
Either that or he's very fond of you.
He loves you and sees you as feminine unlike the others.
A girl might say: Hey girlfriend! or: whats up sister?
well he wants to be a girl
it means they're hittin on you
a girl boy