We had a friend renting a room in our house for 4 years, and he grew in his room, which we all referred to as the "corn" crop. We figured tomatoes are too commonly used as a code name.

Also, I have a brother named patrick, but we call him paddy ("patty" is the feminine spelling, for those who don't know). When I call him for whatever I call him paddy, when I'm calling him down to my room for a toke I yell "pat". My parents are non the wiser .