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1.
The act of presenting an interesting problem to a certain type of nerd, usually a physicist or a mathematician, while he/she is crossing the road, in such a manner that he/she becomes so occupied with it that he/she is soon run over.

First defined on xkcd.
"There's a certain type of brain that's easily disabled. If you show it an interesting problem, it involuntary drops everything else to work on it. This has led to me to evolve a new sport: Nerd Sniping."
by Volland December 12, 2007
 
2.
A sport based on the use of difficult problems to stump and/or stop nerds in their tracks.
I put problems from the GLAT on poster board to have some fun nerd sniping. Man, is it easy!
by IMReader December 18, 2007
 
3.
1. The act of presenting someone, often a mathematician/physicist with a time consuming problem or challenge (often impossible to solve or complete) in the hopes of it appealing to a person's obsessive tendencies.

2. Doing the thing above in a situation where the obsession may lead to bodily harm (in the original context on the middle of a road where they will get inevitably run-over by a truck).
1. The XKCD comic "Click and Drag" nerd sniped me! I never expected it to take so long to explore.

2. There's a certain type of brain that is easily disabled. If you show it an interesting problem it involuntarily drops everything else. This lead me to the development of a new sport: Nerd Sniping.
by willisbell September 23, 2012