When your livelihood was largely based on the ability to accurately shoot long distances, but you are incapable of throwing a corn filled bag a distance greater than 10ft.
All he had to do was get one bag on the board for the win, but he threw a Jarussi.
Jayus is an Indonesian word (that I just made an English word) that conveys the awkward humor behind a joke delivered so badly that you can’t help but laugh. In English, we sarcastically say, “That’s so funny I forgot to laugh.”
When a joke is delivered in a horrible manner, you say, "That was fuckin' jayus bro."