Corporate booking is the practice of organizations or companies buying tickets in bulk at a discount rate to reward their employees or their stakeholders. It's not uncommon for companies to set aside a small fraction of their budget for employee leisure activities, such as tours or movies.
While this can give a marginal boost to a movie's initial revenue, it does not necessarily guarantee success at the box office in the long run.
^Answered this while giving you the full benefit of the doubt of this not being a troll question. (Which is most probably the case)
Now, here's an Urban Dictionary-esque version: A movie's box office collection is usually accredited to Corporate booking in Indian BO context, when a hater finds it difficult to handle the success of a movie. Basically, its a lame excuse for when a film does better than they want it to.
Hope this answers your question.