You can either use the gmail trick INSERTUSERNAMEHEREthen stick a + WHATEVERYOUWANT@gmail.com. An example would be bob+rotmg@gmail.com. The first part would be your regular username for gmail, so in this case bob, then you can add whatever you want after the plus then slap on a @gmail.com and you'll be done.
Another way is if you use yopmail, which is a temporary email.
Hope this helped and sorry if it was confusing,
Aos