She's got the hump, meaning she is in a bad mood. It means to have sex - if two people are humping it means they're having sex. The Black Eyed Peas did a song called My Humps, My Hump, My Lovely Lady Lumps. So you also might hear the word hump to refer to a part of the body. A camel has a large hump on its back,. famously, camels have alarge hump on their back.