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1.
middle seat in the back of a car
Not bitch.. no way in hell i'm sitting in the hump seat again
by Dawn July 12, 2002
 
2.
1. The seat in a van or bus that has the hump from the wheel coming into the vehicle causing your knees to come up to your chest.

2. Making a seat out of the hump from the wheel of a large van (i.e. 15 passenger) in order to fit more people than the vehicle was made for
1. "Let's move seats, I don't want the hump seat."

2. "We can can fit more people in the van, someone take the hump seat."
by hokie March 28, 2006