Similar to putting someone on blast, "sound blast" is to expose one's personal, private or embarrassing information on another level in front of others. This term originated in Miami, FL.
Customer: Girl, I like how you be pourin' that ice in the soda machine!
Tamika: Boy, you crazy yellin' up in here!
Gary: Bitch, that man just put yo' ass on SOUND BLAST!
Jason: Bro, this is turning into a heat up
, le ri