It shouldn’t come as a surprise to learn that hotel staff are often guilty of gossiping about guests behind their backs. But a new ‘secret language,’ recently exposed by Condé Nast Traveler, allows hotel employees to freely talk about guests to their faces without them even knowing.

Here are some of the most common behind-the-scenes lingo Condé Nast Traveler has uncovered:

• Skipper: A person who makes a reservation but never actually turns up to the hotel.
• UG: An unsatisfied guest.
• DG: A demanding guest.
• Pig in the pen: A guest who is struck in the parking ramp.
• Peach: A guest who proves to be extremely difficult to deal with.
• Ghost: Someone who arrives and insists they have a reservation, but they never made one (this one’s from RocketNews24).
• Hoo ha: To go as fast as possible.
• Lobby lizard: When a staff member goes into the lobby during busy times to greet and assist guests.
• 20/10 rule: In one posh hotel, this means to acknowledge a guest when they are 20 steps away, using a nod or a look. When they are 10 steps away, eye contact or personal interaction is used.
• A classic: A very traditional guest.
• VIP: Very important pup.
• VIB: Very important baby.
• Cubs: New employees.
• ‘Walking a guest’: When a hotel overbooks, counting on a 10% no-show rate, sometimes they have to turn guests away and put them up in a different hotel (this one’s from MentalFloss.com).