noun
pillion seat; tandem seat
Wasei-eigo from 'tandem seat'; refers to the rear seat of a motorcycle or bicycle where a passenger rides behind the rider.
wasei-eigo (Japanese-coined English), from tandem seat
バイクのタンデムシートに彼女を乗せて走った。
I rode with my girlfriend on the pillion seat of the motorcycle.
タンデムシートが狭くて長時間乗っていると疲れる。
The pillion seat is narrow and gets tiring on long rides.