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1.
Speed Racer's race car!
I will survive, in my Mach 5.
by George January 04, 2005
 
2.
A badass racecar that Speed Racer drove. known to whoop anyones ass except X's racecar.
OH SHI- there went the mach 5!
by The Insane Hobo May 12, 2008
 
3.
The high you get from mixing marijuana and K2 (A legal herb that you can smoke to get a different high than marijuana).
Dude me and Mike went Mach 5 yesterday. It was intense!
by L0ckh34rt September 15, 2010