any person who you can get to take the fall for you knowing that it will most likely end up in a bad situation.
person 1 "go get my work before the laws see it"
person 2 "where its at"
person 1 "its under the steps, dont let'em see you"
person 2 "aight i got it"
person 3 "i can't believe he went on that crash dummy mission"
person 1 "you know i got this"
someone who is intoxicated and running into random objects that are clearly avoidable.
someone who is cosistnetly tripping or bumping into everything in there path.
Bro 1: How did I get these bruises on my face? Was I in a Fight?
Bro 2: No, you were being a crash dummy last night.
Bro 1: What did I run into?
Bro 2: Everything. Your a crash dummy.