I have heard about terrible 2's but what are they at age 3.?

My three year old has too much mouth. I am constantly punishing her for her "sas-mouth".I want to play and hold and cuddle with her not fight. The way she yells and dosen't respect me or her father makes me feel like i've given birth to a 25 year old. Anyone with a similar problem, hope, or advise??? Please help!