It's a COMIC book joke.
The Big Bang Theory Season 7, Episode 13
From Stuart,
at the COMIC book store.
The Big Bang Theory Season 5, Episode 20
Ooh, ooh, it's
the COMIC book store!
The Big Bang Theory Season 7, Episode 3
...he wants to go party at the COMIC store.
Lot of the guys there are kind of creepy.
The Big Bang Theory Season 6, Episode 5
Did we just see you pick up
a girl in a COMIC book store?
The Big Bang Theory Season 5, Episode 7