1. When your USBkey is full of porn.
2. The act of putting your USB key on a computer to put some porn on it.
3. Having a sexual act with someone you just met.
"I took my USB porn with me so we could see some movies."
"I just USB porned my computer, needed some hard action on it."
"Did you know her?
No, but I made USB porn with her."
A nubbin is a 120V outlet -> USB connector for charging phones etc.
I plugged my phone into the usb wire but it wasn't connected to the USB nubbin, so it didn't charge. I should have connected it to the nubbin and plugged the nubbin into the wall.
A dumb port invented that was apparently designed to replace all cables. However, it was really to screw us over and make us buy new devices and a shitload of adapters.