It should ordinarily mean "Big Fat Hairy Deal". (Note tmesis for emphasis and satirical irony).
Other similar expressions:
A) Tell the Salvos (A reference to the Salvation Army, who "care", as I don't).
B) Yeah, I read about it in "Big Whoop" magazine. – Panucci.
However, because of the "sign me up", it is an exuberant, boisterous expression of celebration as one might expect from a slack-jawed yokel.
Because of this, the full context is important, it may yet be a "not want" parodied expression.
Such as "Oooh, please, can we?" delivered together with a rolled up magazine to the face. Often used on sitcoms.
In the case of the referenced work, the "set up" is in the description of the option, (downplaying the upside as a downside) and the delivery of a "want very badly" acceptance, as the "run down mall" etc. is actually an attractive proposition.
Also common filler material for sitcoms.