1. Ham it up can mean anything. It can be good or bad, just being used to think of something to say.
2. Get ready.
Evan: Well, I have something to tell you....
Jenny: What Evan?
Evan: Well, I don't really know how to say this....
Jenny: It's okay, just say it!!!
Evan: (Deep Breath) Ham it up....
2. Come on! You've been training for your whole life! Just forget everything else and ham it up!!!
To be ridiculous or over-the-top, usually in a comedic way.
"Class was really boring today until Tom stood up on his desk and did a jig. He really knows how to ham it up."
"The actor was supposed to fall over and die, but he hammed it up too much and got fired instead."
To tell someone they are making an untrue or non factual statement.
Dane says " My beauty is far greater than Jase's"
Swainy says " Ham it up ".
When a person, usually a Goldstine in the most un-kosher act, rubs his penis between two grade A hams to become erect.
Stewart can ham it up with the best of them, just ask Richard.