The literal meaning is "Five seconds from seriously losing it." It is generally a word used to describe someone who is 'on edge.' They are at the point just before having a total meltdown.
Person #1: Hey, buddy! I didn't want no goddamn mustard on ma' burger!
Person #2: You need to calm yer ass down.
Person #3: Hit the deck! He's MK5!
Person #1: (Explosion, resulting in the eatery getting leveled)
By Tera
Mk5 Golf Diesel
a car driven by people that want a slow rusty disappointing yet very reliable car, usually driven by balding middle aged men who claim the great diesel mileage is well worth the lack luster looks
god damn look how rusty that mk5 golf diesel is ian, its simply terrible