(b)To have heard Bittersweet Symphony too many times, that your brain cells seem to have recorded the song and plays it back to you at the most in-oppotune times. This takes its name from a band of the 90's-00's which is famous for the songs Bittersweet Symphony and The Drugs Don't Work.
(b)'Coz it's a bittersweet... Damn! If I hear that song one more time...my braincells have been verved
To purposefully, or perhaps absentmindedly (but unapologetically), bump into someone on the street and continue walking.
The term is derived from the famous music video for "Bittersweet Symphony" by the Verve. The video depicts Verve frontman Richard Ashcroft walking down a sidewalk, bumping into everyone he passes--the implication being that he is unmoved by the presence of the other pedestrians.