Hi, I'd say that "geeked up" is very informal. It means you're extremely enthusiastic that you experience loss of senses or loss of judgment. Regards
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CliveHi,Hi,
That may be the meaning in this context. I don't know.
But if you just said to me, eg 'Tom is geeked up', I would have no real idea of what you were talking about. I might guess that you meant 'Tom is dressed like a geek'. Or maybe 'Tom is accompanied by geeks'.
Clive