I just did a quick interweb search of "best bachelor party songs," and the one that came up more often than any other was the Beastie Boys (You Gotta) Fight for Your Right (To Party!). Unfortunately, it never really resonated much with me.
However, from the same Licence to Ill album, No Sleep Till Brooklyn seems pretty appropriate since that's where I'm going.
I may be starring in "The Hangover Part IV"
The worst bachelorette party ever