|1.||Don't bullshit a bullshitter.|
A warning given when someone tries to talk around someone on a certain subject, but the person is very familiar with the subject matter.
Employer: It seems you tested positive for marijuana.
Employee: I was at a party and people were smoking around me.
Employer: The party must have been in a Mini Cooper with the windows rolled up to have this high of a concentration in your urine. Don't bullshit a bullshitter. Clean yourself up or you're out.