Oh, I'm pretty sure I have ADHD, but I'm certain my wife doesn't, and she has done this with smoothies and several other things. She doesn't do it as frequently as me, but she definitely does it.
My point was that it's ADHD if you do this a lot and have problems with controlling that behavior. There are totally different ways to achieve what's in the post but it's just a dumbed down joke meant for people do have ADHD and not the people outside the circle.