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."