A wackin willy is the power of the mind that controls hormones and sends and receives them, wackin Willy sends sex particles to the penis to make it firm.
“ Damn bro I’m gonna go home and focus on wackin Willy so I can exercise my right arm for 20 minutes.”
A person you hate intensely not because they deserve such hatred but because they serve as a focus for your general hatred. A healthy way to dispense with excess animosity.
Jake's not really that big an asshole. He just serves as my hate sink.