Top Definition
The act of preventing another car from cutting into your lane during heavy traffic.
I'm trying to get into the left lane, but this jag off is giving me a nosir.
by rabies August 11, 2006
1 more definition
5 Words related to nosir
the phrase responded when someone attempts to hit your testicles and fails to do so. generally pronounced in a hispanic accent.
ball-hitter "BALLZZ, DAMN I MISSED"
person whose balls were to be hit "no siir"
by Chevy G March 22, 2005

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