Three-Line Diary: Batan-Q

I was surprised that my high school niece didn't know the word "batan-q".

"Huh, what's that?" "It means you're so exhausted that you fall asleep the moment you get into bed." "What's the 'q' part?" "...The sound of air escaping your body?" "I don't really get it."

Even I started to lose track of what I was saying as I explained it.
But I think I'll keep using the word "batan-q".