Female Co-Worker Calls My Man Her ‘Workplace Husband’ Leo and Rebecca Buzz Question

Leo and Rebecca Buzz Question - Went to a gathering this weekend for my husbands work and one of his co-workers refereed to my husband as "Her WORK HUSBAND"...Mind you, they haven't even worked together for a year. When I asked my husband about it he said he had no clue she called him that. Do I have my husband handle it or do I?