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15.
Usually used when girls are over-excited or giggly over a boy.
Girl 1: I talked to Bryan last night. (giggle) (giggle)

Gir 2: Un, you geeking.
by Ms. Pooh August 03, 2005
 
16.
1: Studying very heavily for an exam
2: Obsessing about geeky topics
3: Explaining things with words than non geeks can't understand
1: I've been up all night geeking for my exam
2: We're just geeking over his new phone
3: I couldn't understand a word of it they were just geeking like I was one of them
by Someone with another email address September 14, 2006