(v.) to become friends with someone specifically for personal gain, e.g. befriending the child of a millionaire so you can profit from their parent's wealth
A comment mainly said by women but can also be used by men. Meaning the person you are wanting to be in a relationship with is not ready and or doesn't like you in that way. Such as;
You: I like you, please will you be my insert partner
Them: oh sorry I think we should just be friend's
Sometimes it can be ment in a mean way so people often misunderstand the use of this phrase. But it will mostly be used as a way for a person to be let down without trying to hurt their feelings. Because if it's sincere then a person likes you but maybe not in the way you interpreted it. So what it means;
You: I want to go out with you
Them: let's just be friend's
What it actually means:
You: I have emotion
Them: right now is not a good time
Or
a classification or level of friendship in which the parties of good friends do typically couple-y things, consider each other their "bae", or at a level akin to a significant other; this term is neutral (seeing as gender is a social construct)