A komodo dragon is a man who persistently keeps going for the same (uninterested) girl, until she is worn down enough to give in and eventually relents.
After years of persistently trying, John finally got with Sarah. That guy is such a komodo dragon.
To thrust right when you are about to cum inside your girls mouth and then slam your hand on top of her head which will make her choke and the sound of her choking and looking back up at you which is called the Hissing Dragon.
Also refers to what your girl will look like after.
Dude 1: vro last night I was gettin some action and made my girl do a Hissing Dragon!