the little bus

One of those stubby school buses, usually ridden by children with physical and/or mental disabilities and those pupils who have discipline issues and other problems where they are kept away from the "normal" students.
Please see retard bus.

Jimmy has to ride the little bus because he's a retard.

the little bus by Telephony June 14, 2015

The little yellow bus 

The bus that brings handicapped kids to school

Man, I had such a brain fart today that you would think I came to work on the little yellow bus

The little yellow bus by Exdispatcher January 27, 2009

rides the little yellow bus 

A sarcastic phrase used to describe a persons mental awareness or personality traits.

Tim rides the little yellow bus! Another example.
Oh my God, Tim is so cool, he rides the little yellow bus.

rides the little yellow bus by Sandy kay June 27, 2006

rubbing against little boys on the bus

Something you should never, ever do. Seriously. Never.

Also the punch line in the first verse of the song 'Why mommy left us' By Steven Lynch.

There was once this guy, who I can't name, who is probably in prison this very second for doing exactly that.

"Daddy likes porno and 10 dollar whores. And daddy gets wasted and robs licker stores. And daddy likes rubbing against little boys on the bus. I think that's why mommy left us."

rubbing against little boys on the bus by Pimp-Master J May 17, 2006