Doesn't matter how you pronounce it, as long as when you do use the word you are pointing to the right place.
A person who swallows live animals, bugs, etc., as a form of entertainment at fairs etc. This often included biting off the heads of chickens (iggy pop - chicken, ozzy osbourne - rock dove). The Geek would usually perform in a "geek pit" (rock show). This probably comes from the Scottish geck, meaning 'fool', in turn from Low German. (19th century.)
Geek has always had negative connotations within society at large, where being described as a geek tends to be an insult. The term has recently become less condescending, or even a badge of honor, within particular fields and subcultures; this is particularly evident in the technical disciplines, where the term is now more of a compliment denoting extraordinary skill (like de capo).
sans tete