It's someone who blows up and some haters just invented a term to disguise their denial.
But nah really I think it's when you are signed on the low and you're grinding like you're unsigned until you blow up then you sign your deal in public. Like 2 Chainz who has been signed to Def Jam for like 10 years or Wiz Khalifa who went from WMG to their subsidiary Atlantic. Those two dudes are the only ones I can think of, cause labels will rarely just release someone. Still don't see the conspiracy in it, signed or not it's hard as fukk to blow up.
It's obviously a dumb idea and word cause if it was so easy for labels they would have a factory of industry plants.