The Great Nicknames are Always Taken

The sales manager had an assistant that we referred to as Meat. Another coworker gave him this nickname because he was about as useful as a slab of meat. He didn't work out and was quickly replaced by a young lady we nicknamed Tofu even before she started because we had high hopes that she would be the complete opposite of Meat, or in other words, useful. 

She quit after a couple of weeks, taking a great nickname with her. You can't just reassign it to somebody else, right?