Put one over on somebody
Definition 1 of 1
Pro Tip 1/3Casual Use
Used in informal situations among friends, not for formal or serious conversations. 
When he told me he owned a castle, I knew he was trying to put one over on me.
Pro Tip 2/3Negative Connotation
Implies a negative judgment about the person deceiving; suggests dishonesty. 
Don't trust her, she put one over on her last business partner.
Pro Tip 3/3Skepticism Required
Encourages critical thinking to avoid being tricked or deceived by someone. 
If something sounds too good to be true, they might be putting one over on you.