geek

från merriam-webster:

Main Entry:

Pronunciation:
\ˈgēk\
Function:
noun
Etymology:
probably from English dialect geek, geck fool, from Low German geck, from Middle Low German
Date:
1914
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