A person who goes to insurance, financial or real estate sales presentations where free food is served, who is only there for the free food and is not interested at all in the bullshit being sold.
Sales rep: "Damn plate lickers! Twenty people showed up for the free steak dinner and presentation, but not a single sucker - I mean client - signed up!"
Someone who enjoys performing cunnilingus on a woman.
You know what I heard about John's new friend Jane? She's a plate licker!