a c*t - A c*t is like giving someone permission to bug you with call

A c*t is like giving someone permission to bug you with calls or texts. They probably prefer texts because they're easier to ignore.

Text: 'You're a c*t, so I can text you whenever I want.'

Call: 'You're a c*t, so I can call you at noon.'

Message: 'You're a c*t, and I'm using that to make your life harder.'