An old but cool way of calling something awesome. The term was used a lot in the mid to late 90s.
It has completely dissappeared from the Slang radar after September 11th, 2001 because no one wanted to be suspected of terrorism for using it.
Dude 1: Hey man cool party right
Dude 2; Yeah its da bomb!
Dude 1: This party is da bomb!
Dude 2: Ah! Terrorist!
邮件由 firstname.lastname@example.org 发出。我们决不会发送垃圾邮件。