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1.
Making a reference to sci-fi/fantasy or comic books in which you purposely mix up the wrong character or facts to get a nerd to correct you.
Bill: "Hey Larry, did you know Boba Fett's first appearance was in an episode of Mork and Mindy?"

Nerd; "No it wasn't!" "It was on the Star Wars Holiday Special."

Bill: "Nerd trap!!!"
by Daygzzz October 23, 2012
 
2.
Wikipedia, or any other very inter-connected site with very high information density.
Dude I googled "Tesla" last night at 2pm and I was like trapped on wikipedia 'til the sun rose this morning. Insta nerd trap -- I must know everything!
by devnevyn February 29, 2008