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3.
Noun: when a fart slips out around a turd that is currently making its way out of the asshole without pushing the turd completely out before it fully escapes. A bypASS can be declared if the fart in question is exiting the anal cavity while the said turd is currently crowning and does not cause any part of the feces to fall into the toilet.
When Valerie was in the midst of dominating a very large shit in the bathroom, a rather large bypASS made its way out of her ass while she had only pushed the tip of the poo out.

or...

I could not smell how bad my shit was until the bypASS came out and around my turd into the air of the bathroom.
by Caleb StoneCasa March 13, 2012
 
1.
When one deficates just before a shower and doesn't wipe, but rather goes directly into the shower thus "bypassing" the toilet paper.
I took a crap before my shower this morning and didn't bother to wipe. I performed a bypass.
by BizJamma April 07, 2011
 
2.
Bypasses are devices which allow some people to drive from point A to point B very fast whilst other people dash from point B to point A very fast. People living at point C, being a point directly in between, are often given to wonder what's so great about point A that so many people of point B are so keen to get there, and what's so great about point B that so many people of point A are so keen to get there. They often wish that people would just once and for all work out where the hell they wanted to be.
"What do you mean, why's it got to be built? It's a bypass. You've got to build bypasses."
by Aaronak January 14, 2005