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1.
Overposting on Facebook. An ego disorder leading people to believe their friends want to hear from them more than once or twice a week.
Dude, I'm totally progressive. But, when you Outrage-Post 19 political articles and videos in 3 hours--that's Overbooking!
by Armand Dillo March 27, 2011
 
2.
making dates with multiple people for the same night to meet you at one place assuming that some will cancel or not show and then having all of them show up.
Sarah & Marysol are overbooking for Friday night by inviting Torry, Chris, Mike, Doug, and all of their male friends to meet them at the bar.
by Marysol V. June 21, 2007