Question: "Congratulate this"

[Dave Monroe]

2011/2/21 János Székely <miksaapja at gmail.com>:

> As always, the most simple is the most difficult. Please help. In IV,
> Ch Two, Bigfoot says to Doc that except for loads of cannabis debris
> in his car, he is clean. "No blood or impact evidence we can use.
> Congratulations." To which Doc answers nervously, "Congratulate this,
> Bigfoot". What is "this", what is the connotation"?

... as in, "congratulate THIS" [grabbing his crotch] and/or
"congratulate THIS" [shaking his fist] ...