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Sexual act where someone takes it orally and anally/vaginally at the same time. When 2 people bookend someone, they are bookshelfing or have bookshelved them.
"Were gonna go bookshelf this girl!" "Oh man me and Phil Bookshelved this slut last night!" "So, when are you gonna let me and my boy bookshelf ya?" "I walked in on my mom being bookshelved by my best friend and my dad!"
by BodyDropper July 27, 2008
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A rediculously large rear wing on a car.
Person #1: Look at all the stickers on that bookshelf.
Person #2: Three different tire companies.
by Rupan March 02, 2007
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Code name underaged drinkers use for getting blackout drunk in a friends room, a bookshelf may or may not fall on someone.
Bookshelf tonight in Monica's room, should we get popov or Smirnoff?

Bookshelf was intense last night, we had to stick a toothbrush down someone's throat to make her barf up the Bacardi 151.
by AmoneyNdaHouse March 12, 2017
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