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
Speed Racer's race car!
I will survive, in my Mach 5.
by George January 04, 2005
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