When doing a tonser you ride your bike as fast as you can through the Frederiksberg mall. It's extremely dangerous because you have to take measures of people's safety, while not getting caught by the guards. If you succeed to do this, you will earn yourself respect in the hard streets of Frederiksberg (or at least in the aisles of Frederiksberg Gymnasium)
''Did that new kid just do a tonser?''

''Wow that's crazy, he's a real lad!''
by Techno Niels November 13, 2015
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