The awesome, almost sexual, rush you get from something totally nerdy.
Mel: "Did you see the Red Dead 2 announcement?"
Andrew: "Yeah, it made me nerdjaculate in the middle of the office"
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When a person is so excited about a subject (usually books, technology, graphics in a movie etc.) that all they can do is talk about it. The verbal version of nerdgasm
“Did you hear about the new iPhone x500?! It has....” *nerdjaculates for thirty minutes about the phone*
“I love how the author shows...” *nerdjaculates for twelve years about the characters falling in love*