1. mail bomb - Noun
2. mail bomb - Verb
An explosive device sent through the post; a letter bomb or parcel bomb.
(computing) A large number of e-mails sent to one destination, or an e-mail with a very large attachment, as a denial-of-service attack.
mail bomb (third-person singular simple present mail bombs, present participle mail bombing, simple past and past participle mail bombed)
To send a mail bomb (of either sense).