Demi Lovato has a constant ''sausage-fest'' going on in her mind.

The 'Neon Lights' singer's sense of humour is so dirty and her language so filthy that she claims she's far more obscene than any guy she knows.

She giggled: ''I have a really foul mouth. I say anything and everything that's on my mind. I can be really vulgar. My sense of humour is really, really vulgar. It's worse than 10 guys put together in a room. There's a sausage-fest going on in my brain of inappropriate humour!''

Demi also opened up about another of her weirdest habits, constantly snacking on gherkins.

Asked her favourite food, she told We Love Pop magazine: ''Gherkins. I love them. I could just drink gherkin juice.''

The 21-year-old star feels akin to country queen Taylor Swift because they share the same hatred of nightclubs and preference for avoiding writing about partying.

Demi explained: ''I don't really care because those things don't apply to my life. A good example of that is Taylor Swift. We've had conversations about this where I'm like, 'I have so much respect for you as an artist because you don't have to write about that stuff.' She's like, Well, I don't go out'.

''I don't go out to clubs and I don't party. I want to be a respected artist and not a tabloid headline.''