a and m switch?

i have a 93 bmw 325is and there is a switch that on the top has an "a" and on the bottom had a "m" i hit the "m" and i hit the gas and i
acelerate slow then i hit the a agian and it gose of and i acelerate normal idk wtf it dose hope fuly you guys do.
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This selectd the driving mode: Asshole or Maniac.
It's also found on all other German cars and Volvos.
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