I need a code word?

Ashlynn and I are going to have a baby in about 4 weeks. We have our disagreements from time to time and sometimes those blow up beyond that. We don't throw plates and break dishes or swear but we do get a little fired up from time to time. So I had a horrible thought today about having one of those episodes in front of the baby. I don't want that at all so we decided to make some rules.

1. We would establish a code word to avoid a fight.
2. We would both honor that code word when spoken by either party and stop in our tracks.
3. The code word is defined as follows: It means that no matter how angry, frustrated or upset we are we stop and walk away and don't say another word.
4. We must use the code word BEFORE we get to the point of boiling over so we don't get to the point of an explosion.
5. Once the code word is used we do not say one more word about the problem until we can talk about it by ourselves in a calm way to avoid any blow ups in front of the baby.
6. If we are not too upset or mad we can step into the other room and talk about it and put it to bed so we don't have to wait till later.

This is all in effort to keep a peaceful spirit in the home. The problem now is we need "Code word." Do you have any suggestions to help us pick a code word?