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A nickname for Hailey. They're the kind of person who thinks everyone's a loser, but still lets you live with them.
You: 'Why are you letting me stay here?' Hailss: 'Because I'm nice, and you're not worth the effort.'
Hailss texts you: 'I'm still nice even though you're a disaster.'
You: 'You're the only one who puts up with me.' Hailss: 'Yeah, and I'm glad I'm the only one.'