Duck Party
The act of semi-violent oral sex on a male, when the male forces the penis into the back of the females throat over and over, causing a gag effect that sounds very similar the sound of a constant quacking duck.
Molly and I had an awesome duck party last night. She quacked her brains out.
Floating Duck Party
That act of dosing an unsuspecting person with LSD, usually by spiking the person's drink.
We through a floating duck party for Dave, and now he's freaking out in the fetal position on the floor and will probably have to go to the hospital.