v. 1 To refresh yourself, like if you've been daydreaming during a meeting.
v. 2 To wake up.
Origin comes comes from the use of F5 as a "Refresh" key for MS Windows applications.
Frank: Greg, what did you think of Tom's suggestion.
Greg: (Daydreaming) Huh? Wha?
Tom: F5, dude!
I can't really F5 until my second cuppajava.
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