Top Definition
1. an address book containing the contact information of those one has macked upon

2. an address book used as a reference for making booty calls
a) Person one: bro, we need to get some bitches up in here

Person two: let me look some up in my mackbook

b) Person a. : did you get that amputee porn star's number?

Person b. : yeah, i wrote it down in my mackbook
by Der Bootymeister September 26, 2011

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