A phrase used when a you know someone is talking bull shit.
When you know the persons story has virtually no accuracy what-so-ever and that the person makes them-self out to be the best.
This phrase comes from the fact that when the story is told that anything can happen to make the story teller sound cool and tough, such as I was in a fight with 20 ninjas and I beat them all in 20 seconds.
Story Teller: I was walking along the street then 5 gangsters jumped me. 7 of these gangsters had guns, they were shooting at me so I beat one up, took his gun and killed them all in one shot, because they were all in a line.