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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
 
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