spumble

The phenomenon whereby a person's mouth fails to articulate a string of words, to the point where all meaning is lost. The utterance of gibberish whilst perfectly sober. This is a stress induced condition where brain and mouth disengage during an attempt to make a witty comment.

It was the day my grunmadoma errrblummm.
Would you like to fdsjio mran fdhuhop.
You really spumbled your way through that sentence.
Would you spumble that again?

Spumble

Verb; The action of a bumblebee spinning instead of bumbling

"I've been watching these bumblebees spumble for the past week..."