Said in two different environments:

1. When commuting on the bus and one is engaged in a mobile phone conversation, it is used to avoid talking loudly about embarrassing topics in a crowd of eavesdropping fellow commuters.

2. When person A is tired, or doesn't see the logic of why person B has called, this can be said to avoid conversation with person B.
1. A: "Hey what did the doctor say about that lump on your balls?"
B: "I'm on the bus."
A: "Oh aight."

2. A: "Hello?"
B: "Hey, will you be hungry in half an hour?"
A: "Aren't I meeting you in half an hour?"
B: "Yeah, but I want to know how hungry you will be."
A: "I'm on the bus. See you soon."
by Autumnzz July 31, 2008
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So I was riding home from class on the bus through the mall parking lot. At my mall, there is an exit where the incoming cars have no stop signs, but the cars exiting the mall do. As you may have heard, there is a hefty bit of snow happening around the midwest, so stopping a bus in this mess is a tinge difficult. Anyway, We were rounding that corner coming out of the mall when a little sedan comes zooming up, trying to whip into the mall. The bus, already midturn, obviously isn't going to stop for this dick. The guy honks, and I'm sitting towards the front where I hear the bus driver(an African American individual) mutter to himself "Bitch... I'm a bus." and keeps driving. I laughed out loud, unable to contain myself.
Now, whenever I want to say I just don't give a fuck, instead I proudly exclaim "Bitch I'm a bus."
by juanchopancho February 2, 2011
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The phrase "Bitch, I'm a bus", is used to convey awesomeness and a carefree attitude in oneself. Saying the phrase implies that you have the "fuck that shit" attitude and that you feel invincible, as nothing can stand in your way.

Originated in the community website 'Reddit', posted by user Bamka.
Example 1

Guy A: "WATCH OUT BRO YOU'RE ABOUT TO HIT THAT TREE!"
Guy B: "Bitch, I'm a bus."

Example 2

Bob: "Tyler, are you sure it's a good idea to roll a joint here? There's 3 cops staring right at us..."
Tyler: "Bitch, I'm a bus."

Example 3

Tom: "Jim, Sarah's really mad at you for kicking her out of the house after having sex last night.."
Jim: "Bitch, I'm a bus."
by bluersx February 7, 2011
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when you're having a realy really bad day
hey man how are u?
I'm on the strug bus bro.
by peteke2468 February 4, 2016
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Gay "code" for saying you're about to go and get sodomized.
Where you going?

I'm taking the bus

Well alright, be careful son
by AJiwnl September 19, 2023
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