Its meaning changes with the situation it is used in. It can be praise or condemnation. An exclamation of failure or of victory, awesome or lame!
"Man, I just killed that bear bare handed! I really shit the bus on that hairy son of a bitch."

"Dude, buddy, dude, I totally forgot how to ge to the beer tent. I completely shit the bus."
by kai1980 July 10, 2009
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A mode of transport for the poorer person.
'u gettin a taxi into town mate?'

'nah mate i'm poor i'm jumpin on the Slumdog Shit Bus'
by elroys_here April 5, 2010
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