What does the saying her tongue is tied in middle and ball bearings on both ends mean?

The saying "her tongue is tied in the middle and ball bearings on both ends" is a humorous way of saying that someone is extremely talkative and rambles on incessantly.

The imagery suggests:

* Tongue tied in the middle: This implies that their speech is jumbled and confused, making it difficult to follow what they're saying.

* Ball bearings on both ends: This implies that their speech is fast-paced and unstoppable, like a runaway train.

It's important to note that this is a slang expression and is often used playfully or sarcastically. It's not meant to be taken literally and shouldn't be used to be rude or dismissive.