Austin Mahone -- I Got a Segway ... To Match My Douchemobile!

There's a bad pattern surfacing in the young life of Austin Mahone.

The singer was rollin' through Miami Friday on a segway with a felonious design ... which now matches a Range Rover that makes Justin Bieber's reflective whip look understated.

BTW .... the segway has speakers.

One day he'll look back and regret this ... we hope.