look up any word, like smh:
 
1.
1.used to describe the act of traveling at excessive speeds in a motor vehicle

2. utilizing a lifted vehicle or 4 wheel drive to traverse over obsticals
man last night i was out in the car phuqqin mashin' like no other.
by Clay VO January 27, 2004
 
2.
Mashin is a word used to descibe beating some one up very badly. Or also can be used as insultin someone very badly.
Example = Man I seen you at the club the other night straight mashin on that mutha.
Meaning: I saw you at the club the seriously beating someone up.
by Dazzle June 04, 2006