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
You feel it building up in your intestines for a day or more. You bend over in pain like you have a kidney stone near the end.
Then you sit on the pot, and BOOOOOMM!

SHIT, AIR, and more SHIT AND AIR exit your hole at extreme velocity.

You get the wind knocked out of you and sometimes take a little "nap."

It's takes you 7-10 minutes to recooperate.

You DO feel wonderful afterwards though.
Sorry I was in the bathroom so long, I Mach 5 'd and blacked out for a while.
by SexualHotsauce November 4, 2019
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 16, 2010
Partying extemely hard.
"After work, Tito hit the bars. He was going Mach 5 all night."
by The Impresario September 15, 2006