Brain Injury Support Group
Traumatic brain injury occurs when a sudden trauma causes brain damage. TBI can result from a closed head injury or a penetrating head injury. Symptoms of a TBI can be mild, moderate, or severe, depending on the extent of the damage to the brain. Outcome can be anything from complete recovery to permanent disability or death. A coma can also affect a child's brain.
But I do have those blips, where I'll be unable to speak, or scramble words or can't remember words.
I saw on your profile that you were injured as a child. So it's probably harder for you to remember the "before" and "after" of having suffered a TBI.
That's my long, rambling response to say that yes, what you experienced is common w/a brain injury - speech difficulty. Where, we will think of one thing but something else comes out. People often think of speech problems solely as garbling words. But what you describe is a type of speech problem where your brain says one thing and something different comes out of your mouth.