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Haha sure.
So, if your email was muppetteer@gmail.com, and you had already registered to buy something from CRC, so didn't qualify for the new user discount you could sign up again using the email muppetteer+crc@gmail.com and it would both register as a new email on their system and still arrive in the inbox of your good old muppetteer@gmail.com email.
You can do the same with other variations, such as muppetteer+lfgss@gmail.com or muppetteer+beaker@gmail.com and they should all work, ending up in the same inbox.
If you use Gmail, you can put '+crc' between the end of your email and the @ symbol and it'll think it's a new email, but will still end up in your inbox. You can do it multiple times with multiple variations.
Can be handy for things like this.