Performing monkey 

Someone that would do anything to keep the guy/girl they like happy. Also involves doing almost anything that they ask without thinking and putting their needs before their own.

Steve asked me to work out his overtime for the past 6 months while I was flat out at work

Wow and you did it? Are you his performing monkey or something?!

Performing monkey by Pizzacat0987654321 June 5, 2014