geek 
(gēk) Slang
(gēk) Slang n.
1.
a. A person regarded as foolish, inept, or clumsy.
b. A person who is single-minded or accomplished in scientific or technical pursuits but is felt to be socially inept.
2. A carnival performer whose show consists of bizarre acts, such as biting the head off a live chicken.
tr.v. geeked, geek·ing, geeks
To excite emotionally: I'm geeked about that new video game.
[Perhaps alteration of dialectal geck, fool, from Low German gek, from Middle Low German.]
geeky adj.