Basically is the laziest, most meaningless word in the entire English language.

It frequently pop up in speech, usually at the start of a clause. The only thing it does to the semantic construct of a sentence is to make the user's statement sound slightly more certain. However, in loading a sentence with additional words, it detracts from the main message (the signal to noise ratio kicks in). Consider that of the two sentences:

Basically, you need an invitation to attend Fred's party
You need an invitation to attend Max's party

Both parties appear equally unwelcoming to those not holding invites.

Basically has a sister - 'Essentially'.