(v) To make an extremely inaccurate throw.
Comes from LSU and Oakland Raiders quarterback JaMarcus Russell, who despite being a highly touted prospect and the #1 NFL Draft pick in 2007, had an extremely unproductive NFL career due to his inaccurate passes and was out of the league after the 2009 season.
After she caught me banging her sister, my girlfriend chucked a shoe at my head, but fortunately she jamarcused it and broke the window instead of nailing me in the dome piece.
We would have won that cornhole game if Jimmy hadn't been such a jamarcus. He only hit the board three times in the entire game!