two-seating
driving with your right arm resting on the back of the passenger's seat
"Chains gleaming, switching lanes, two-seating..." -Nas in "Hero"
two seat ass
A person so obese as to take up two seats on the bus or subway.
Man, my knee is fucking killing me but that two seat ass whale over there just sat down and took up the last two seats. They should make her buy two metropasses!