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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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Jul 26 Word of the Day
Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed
I got a call from X the other night. She had an extra ticket to a concert she bought for a friend, but they couldn’t make it so she called me to ask if I wanted to go because I am her Second String Friend.
by Deus-ex-machina August 26, 2020
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