Definitions

Pimp-1.) to pimp something out is to *make* it look very ghettofab and all that nifty stuff in the above paragraph.
2.) to pimp is to advertise (generally, in an enthusiastic sense) or to call attention in order to bring acclaim to something; to promote. Hack- Slang. to deal or cope with; handle: He can't hack all this commuting

Mod- To modify something. Usually refering to to the technically inclined
I gonna preform a case mod so I have a tricked out computer

Mash-up: To take elements of two or more pre-existing pieces of music and combine them to make a new song.

These definitions are all both similar and different in their own seperate ways, they all, more or less mean to change or "modify" something.