in cars that have them, where a girlfriend sits when her boyfriend is driving. in no other situation would anyone want to sit in it.
my girlfriend always sits in the middle seat in the truck so we can snuggle and kiss while i drive.
When a man or woman sits between the laps of two men and inserts both penises into their anus or vagina.
The Middle Seat is a really difficult position to get into.
The middle seat in some cars. Between the driver and shotgun. Also see: bitch seat.
John was a poor bastard, being the last person picked up before the road trip. Therefore he was forced to ride in the middle seat.