A bustitute generally refers to either:

1)A Substitute Bus Driver.

The "bus" stands for the vehicle & the "titute" is short for Substitute which is a replacement for your original Bus Driver.

2)A Prostitute who frequents a city bus, school bus, or any type of elongated vehicle used to transport people from one distance to a designated area. The Bustitute, in this case, is often seen on the same bus once or several times a day on the same bus at the same time.
1) "Our bustitute sucks ass. I'm gonna squirt her with moldy ketchup."

2) "That Bustitute is pissing me off with that awful smell of hers and the way she smokes. I might just kill her."
by K9S25AA12 May 25, 2010
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Any replacement or substitution of rail service with bus transit, whether permanent or temporary. Often used to reflect an inferior quality of service.
Due to track construction on the Red Line at the Charles/MGH stop, there will be bustitution this weekend between Kendall and Park Street,
by Andrew Schwartz November 1, 2006
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