Pretty much the awesomest and most feared bro ever. He has been living for what many historians equate to,"Fucking forever" and has been the cause for some of mankind's greatest catastrophes, namely, the Rape of Nanking, 8 of the Crusades (he's not a fan of the Arabs), and the early 21st century release of "From Justin to Kelly". He is currently only spoken of in closed corridors at night by those deemed worthy and even they are forced to secrecy. That noise you heard last night when you woke up next to your girlfriend? He just impregnated her and evaporated. Seriously.
Someone named Robert: I just straight Jesse Knapp-ed that dude in COD.
And then Robert is killed because Jesse don't take that shit.
A highly contagious STD that doesn't necessarily do anything. Once contracted the victim has a highly increased chance of getting dangerous STDs. The Knapp is contracted through any form of penis to vagina contact with any other victim. Side effects of The Knapp are lowered self esteem, occasional mocking, and a significantly reduced chance of ever getting laid again.