It is getting deep

At the end of the workday, one cowboy tells another, "That new bull nearly did me in today, pard."

"Oh yeah, what happened?"

"I was putting out the feed, when the sucker came charging at me like a locomotive from hell. Damn near got me!"

"So, how'd you get away?"

"The bull kept slipping. He slipped three times, and that gave me a chance to make the fence and jump over."

"Man, that's scary. If it'd been me, I'd probably have shit all over the place."

"What do you think that bull was slipping in?"