This is the 13205th most frequent German word.
auffahren
"To drive onto, to collide with, to serve (food), or to rise/startle (context-dependent)."
In this context, 'auffahren' is used transitively to describe driving too close to another vehicle, leading to a collision.
Der Autofahrer fuhr zu dicht auf und verursachte einen Unfall.
The driver followed too closely and caused an accident.
Here, 'auffahren' is used metaphorically to mean presenting or serving something, often in a generous or impressive manner.
Beim Büffet fuhr er mit großer Begeisterung die besten Gerichte auf.
At the buffet, he brought out the best dishes with great enthusiasm.
'Auffahren' in this case indicates the action of driving onto or against something, usually resulting in physical contact.