lack of balls
A pansy who yaps about you when you're not there but runs like a dog when you come for them.
My friend said I was a disgrace to my other friends, but when I showed up, he ran out the door like a dog.
My coworker said I was a joke to my boss, but when I walked in, he started pretending he was working on a spreadsheet.
My brother said I was a failure to my mom, but when I showed up, he was too scared to say anything.