1. evil gesture before a button is pushed opening a trap door beneath the person, sending them to a fiery death
2. Saying goodbye (forever)
I did a little hand waving before I let the man know he was being sent to my hell pit below him.
Attempting to get past a moment when a difficult explanation is required.
His project was late and all he could offer was some hand waving.
1. Navy slang for semaphore
2. The crude pidgin language adopted by vastly intelligent scienticians when trying to explain complex ideas and theorems to a normal person with only average intelligence or less.
The radio was broken, so the crew of HMS Ipswich had to rely on Hand Waving.
With a lot of Hand Waving, professor Auld was able to explain to Helen the importance of 2+ 3+ alternate magnetic coupling in an antiferromagnetic arrangement.
Also written handwaving. In formal conversation / speech omitting important details about the subject matter either because 1) the audience is perceived to be ignorant 2) the speaker themselves is not well-informed on the subject matter or 3) a little from column A and a little from column B.
The math professor only gave a partial description of the proof as she used hand waving to get through the most difficult part and told the students to study the remained of the proof at home.
Saying hello by waving your hand.
I waved at Susan as I walked past her.
the motion of moving the hand back and forth. Used as a nonverbal sign of greeting or farewell between two people
I waved my hand at fred.
someone using hand waving as an insult or someone says handwaving and you turn it into an insult
i waved my hand at you. well im waving my hand up yo ass