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1.
Boom Selecta is synonymous with DJ or disk jockey. This can be any person at any level who is choosing the music for a party, club, or social event. In proper English it would be Boom Selector, however Selecta sounds better. In other words, a Boom Selecta is someone who selects mad booms.
Yo! Boom Selecta play dat new Wayne track.
by Twinesniper44 April 25, 2010
 
2.
Used as a greeting, a more emphatic and energetic version of "hello"
"Boom selecta! What's going on dude"
by Chap Chavin May 05, 2006