General terms for foolish talk:
* Blabbermouthing: Talking excessively and often indiscreetly.
* Rambling: Speaking at length without a clear point or direction.
* Prating: Talking foolishly or boastfully.
* Babbling: Talking incoherently or senselessly.
* Ranting: Speaking passionately and often irrationally.
* Spouting nonsense: Speaking without any substance or logic.
Terms emphasizing speed:
* Gushing: Talking rapidly and enthusiastically, often without thinking.
* Blurting out: Speaking impulsively and without considering the consequences.
* Spilling the beans: Revealing something confidential or embarrassing without thinking.
Terms emphasizing the foolish aspect:
* Talking through your hat: Saying something without any basis in reality.
* Talking out of turn: Saying something inappropriate or untimely.
* Making a fool of yourself: Behaving in a way that makes you look stupid.
Ultimately, the best way to describe the situation depends on the specific context and the tone you want to convey.