BOOM could be defined as:
1. When something is good, great or amazing.
2. When someone does something good, great or amazing.
3. When someone says something good, great or amazing.
For Example: "That party last night was boom"
Boy smashes a window - "Yeah dats boom"
"Wanna hit up BigWigs after?" "Yeah boom"
Now there is where 'Boom' began. After which, through the evolution of the English language throughout the last few months it was begun to be used as a verbal exclamation. Where in a sentence you would see '!' , you would exclaim, 'boom'.
Furthermore, the current definition of 'boom' would best be described by the following examples:
"Yo, did you see that broad?" - REPLY: "Yeah man she was boooom." or on the contrary: "Man she was DUTT/DUTTSKIES/DUTTYTINGZ/BUMTINGZ/BUMBUM/NOTEVENBOOM"
The word most associated with 'boom' in recent times would be 'pho' which is a Vietnamese rice noodle served in a soup typically with beef or chicken.
"That pho was booom!"
"Yo that party last night was BOOOM... but not as boom as pho!"