[Emithith]

nerd
   [nurd]
noun Slang.
1.
a stupid, irritating, ineffectual, or unattractive person.
2.
an intelligent but single-minded person obsessed with a nonsocial hobby or pursuit: a computer nerd.
Also, nurd.

Origin:
1960–65, Americanism; obscurely derived expressive formation

geek
[geek]
geek
  [geek]
noun Slang.
1.
a computer expert or enthusiast (a term of pride as self-reference, but often considered offensive when used by outsiders.)
2.
a peculiar or otherwise dislikable person, especially one who is perceived to be overly intellectual.
3.
a carnival performer who performs sensationally morbid or disgusting acts, as biting off the head of a live chicken.
Origin: 1915- 20; probably variant of geck (mainly Scots ) fool < Dutch or Low German gek
Related forms
geek·y, adjective

It seems it's gotten so convoluted that the street doesn't know what it means even though they use it.
A nerd is an anti-social person, that prefers to keep to their self, and "pursue anti-social activities" while a geek tends to just get top marks etc, and gets labelled because of it.

I am a "geek", but it wouldn't be true if people actually bothered to pay attention in class.