A variation of 'please', how it started and where it came from is unknown; often used in a lighthearted playful manner between friends.
For example a polite 'Oh thank you preeze~' spoken in a teasing tone of voice with no mal intent; or 'Mmm preeze~' spoken with a flirty or playful joking tone
Preeze is an informal, non-standard way to spell the word "please" and it's not a common usage. It's used by some people in certain communities or social groups, similar to other informal or colloquial language. It's an alternative word to please, usually used in a casual or informal context.