got nothing to prove

When you ask someone for proof to their statements and they say 'I got nothing to prove' which basically means they're bullshitting.

Connor: yeah I have a new r9 390x graphics card
Bob: Show me a screenshot of your PC specs
Connor: I got nothing to prove, I'm not lying

Bob: Then show me some proof
Connor: got nothing to prove.
Bob: But your bullshit? lmao.