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1.
Replacement for "good times" or the like, usually in reffrence to something sterotypically highschool (as in Fast Times at Ridgemont High)
Did you go to Max's party last night?
Yeah, fast times, man.
by Boo_Radley October 12, 2006
 
2.
(1) Daylight saving time (i.e., Summer Time)

(2) Prevailing time on the eastern side of a land time zone boundary.

See "Slow time."
(1) "I just can't get used to this fast time."

(2) "Crap, I forgot they run on fast time."
by Zoned September 13, 2013