Nick, this is what you posted. The phrase is actually, " the south end of a north bound cow". In other words an ass. For more info, look in a mirror.
Wally, it's obvious Nick is not a mental giant. Punctuation, grammar and spelling are one thing but no reading comprehension is another matter. I'm afraid if Nick is a product of the local school system, I can no longer defend that system. If the schools are allowing redneck illiterates to graduate, there's a problem.
Remember Nick, the south end of a northbound mule. Breaking it down.
Cows' head points north. Cow begins to walk in a northern direction. Back end of cow (Nick) must follow north bound head of cow. It is physically impossible for the south end of the cow (Nick) to go south.