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It means your using nitrous oxide in your car. Often used when your racing with someone.

Man: are you on the bottle?
Chick: no, i'm all motors :)
by Motors November 09, 2006
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"Are you on the bottle?" means "Are you drunk?"/"Have you been drinking?" in British English.
John: I think my team is gonna win the trophy this year.
Geoff: Are you on the bottle? They're bottom of the league, they'll never win!
by JackSht December 27, 2016
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