Acronesia
The act of temporarily forgetting an acronym, and needing to look it up, or ask a friend what it stands for.
"What's SMH again? Darn it, I KNOW THIS. I guess I'm having another fit of acronesia..."
acronesia
complete or partial loss of memory of the words represented by an acronym.
"ESPN stands for, uh, something Sports something Network. I've got acronesia!"