Lacoulas
A person you go to for advice, but they're clueless and just making it up as they go along, pretending they know what they're talking about.
'I told you to do the math homework, not just fake it like you’re a math genius.'
'He gave me life advice, then said he didn’t know what he was talking about.'
'She told me to quit my job, but she just quit hers two days ago.'