A type of person that says they can do something, but when the time comes to meet up with the person that invited them to the event, they make up some lame ass excuse to why they can't come.
Person 1: Can you make it to the target center for the Ozzy concert this evening at 6?
Person 2: Totally dude.
*at 6:05 PM*
Person 2: *calls person 1 on his cell* sorry dude I can't make it, my dog has toenail fungus and I need to bring him to the vet
Person 1: okay *hangs up* God I know so many fucking bailers!