Nubar

Standing in a person's path when they are trying to do something important. Usually involves spouting off esoteric information, telling stories with questionable validity, or asking people to guess which song is stuck in your head.

"Bro, I used a high-carbon atomizer to clean out the exhaust manifold on my civic... Jacked up the horsepow---"
"Don't nubar me dude, I'm trying to get this chick's number."