blow-off

from The Collaborative International Dictionary of English v.0.48

Blow-off \Blow"-off`\, n.
   1. A blowing off steam, water, etc.; -- Also, adj. as, a
      blow-off cock or pipe.
      [1913 Webster]

   2. An outburst of temper or excitement. [Colloq.]
      [1913 Webster]