What is the meaning of bffr in genz slang?

The meaing of the word bffr in genz slang means the following:

• Abbreviation for 'Be fucking for real', meaning 'be serious' or used in disbelief at something incredible.
• Often used in casual conversations or online to express doubt or demand seriousness.

Example

You think you can finish that entire pizza by yourself? Bffr.