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1.
The act of repeatedly pressing the f5 key to reload a web page in anticipation of an update. Most commonly associated with social aggregate sites like 4chan and Reddit.
1: Man, you look tired this morning.
2: Yeah, I was up all night f5ing 4chan.
by reenact12321 January 01, 2012
 
2.
When Reloading, Refreshing, To Refresh, Time of the month, So on so forth(hehe).
"This is taking to long, I'm F5-ing this shit!"
by HaYouKnowItsTrue July 22, 2014