To compete in manner in which uses blood.
"Want to see who can donate the most blood the quickest?" Brooke
"Ok, sure first one to dontate a unit wins" Cody
"I finished a unit in 5:56 and your was 6:38! I Win" Brooke
30 mins later
"Hey guess what Mitch?! I beat Cody at blood wrestling!" Brooke
"Good for you..." Mitch