When you're discussing something geeky very intensely.

When you know a lot of information about something unusual, usually nerdy, and express it with great enthusiasm.
Bruce: Batman never killed his villains until Robin died, which is the only reason why people began to call him 'The Dark Knight'. And in the series 'The Dark Knight Returns', Robin was a girl after Jason died.

Wayne: Dude, relax. I only said I was excited for The Dark Knight.

Bruce: Sorry, I was nerding out for a minute there.
by LadyHailey July 14, 2008
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1. Getting overly excited about something that isn't generally "cool".
Ex. I completely nerd-out when I watch Harry Potter
by lynseylove March 12, 2011
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To do a particularly nerdy activity such as playing a videogame, writing computer script, or doing math problems, and zoning out while doing them.
Oh, sorry i was nerding out there.

Try not to nerd out this time, ok?

Oh fingernailpiss, he's nerding out again.
by Anthony Fleck April 11, 2008
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nerd-out: 1) verb. To overindulge in computer related activity.
2) noun. An event marked by wanton computer usage or kindred digital activity.
1) Turn-off that computer and stop nerding-out!
2) Sorry I can't, I am in the middle of a major nerd-out.
by Marcus Macdonald May 24, 2008
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To avoid a fun or risky activity in order to get some extra studying done.
dude a: "bro, we're gonna base-jump off the Brooklyn bridge and then shark-dive with white killers! are you in??? "

dude b: "sorry brother, I think i'm gonna NERD OUT today. I have a midterm exam tomorrow".
by Jeff Ferdinand the Third October 1, 2010
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nerd-out: 1) verb. To overindulge in obsessive, computer related activity.
2) noun. An event marked by wanton computer usage or kindred digital activity.
1) Turn-off that computer and stop nerding-out!
2) Sorry I can't, I am in the middle of a major nerd-out.
by Marcus Macdonald May 24, 2008
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To go over board about a particular subject. In doing so, causing the none nerd's eyes to glaze over....
Person 1: "Hey I played (X) videogame the other night. It was actually fun."

Nerd 1:"I absolutely love that game!" Then goes into extreme detail about said topic, while the other person just kinda stands there.... Then finally the nerd realizes what he has done saying "Sorry man, I kinda nerded out for a moment there..."
by mdm1390 September 8, 2008
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