What is On Blast?
1.
to embarass someone or to make someone look stupid
"I heard you told Jay he had bad breath in front of the whole class"
"Yeah, I put him on blast"
See
2.
verb - context: to put one on blast; to embarrass someone or put them in an akward position by revealing compromising information
Why you puttin me on blast like that? (Why are you trying to embarrass me?)
See
3.
verb - (to put one on blast); to embarass someone or put them in an akward position by revealing compromising information
Why you puttin me on blast like that? (Why are you trying to embarass me?)
See
4.
At a high volume; loud
"He was riding down the block with his speakers on blast."
"Damn, son, your shirt is on blast."
"The way he was messing with the knobs I thought he was about to put my shit on blast."