When, while sitting at a bar, a person is flanked on either side by individuals who have chosen to take out books and read rather than continue a conversation. Also known as a Bilateral Booking.
At the Zig Zag last night Brian tried to talk to two babes, but ended up completely bookended.
To have yourself confined to a space smaller than what is needed to accommodate you comfortably, usually referring to when you're lying on the couch and you're unable to stretch all the way out because your head and feet press against the armrests.
dude: "Seriously, I'm done feeling bookended by this couch. I'm getting a new one."
To pad the start and/or end of vacation leave with sick days.
Homer bookended his vacation to Paris, by taking a sick day to pack, and a sick day to recover from jet lag.