Dictionary fun: Geek

Pronunciation: 'gEk
Function: noun
Etymology: probably from English dialect geek, geck fool, from Low German geck, from Middle Low German
1 : a carnival performer often billed as a wild man whose act usually includes biting the head off a live chicken or snake
2 : a person often of an intellectual bent who is disliked
3 : an enthusiast or expert especially in a technological field or activity geek>

Courtesy of Merriam-Webster.