This term has a number of connotations and is typically used in casual circumstances. A dull person who is dressed in quite unattractive attire is one definition of a "geek." This individual has very low to no social skills.

You must be crazy to ask a geek like Govind for fashion advice.

I don't want you to invite that geek Harish to our party.

A geek is a person who has an authority or has extensive knowledge in a certain field (for example, technology). He has a rather small area of interest, yet he is quite knowledgeable.

If it is a computer geek you require, you'd better hire Dravid.

The name is derived from the Dutch word "geek," which means "stupid." Shakespeare used the phrase in some of his plays in this way. In the 1920s, Americans referred a someone performing strange acts at a circus as a "geek." The first "geek" was a performer who delighted his audience by biting off the head of a live chicken or snake! Throughout time, the term came to be used to describe someone who lacked social skills or had interests that were substantially unlike from those of others.