Someone who decides to act bold and cocky around other individuals that are
weaker/smaller/less intimidating than them but
crumble once they are in the presence of someone who
towers over them (bigger).
Joe
lolly: Hey mark, that guy called you a fag!
Mark: Where?!
Joe lolly: That
big dude in behind you.
Mark: Oh, well he's kinda big, but if he were
my size I would take him on....
Joe lolly: Dam bro, your a choosey tough guy.