spout off

Definition

Slang

  • verb to talk volubly, pompously or out of turn. A post-1970 version of the earlier ‘spout’ or the more literary ‘spout forth’, suggesting the outpouring of words. Spout off, like ‘mouth off’, is usually used intransitively and is more disparaging than the earlier forms.
http://www.dictionarycentral.com/definition/spout-off.html