F5 is a computer shortcut that refreshes the internet browser. So just pretend you are the internet browser..
** Very hot climate! **
Hydrated person: Hey man, would you like a chilled can of pop
Dehydrated person: O....(gasping for air)...MG yuus
Dehydrated person: **skulls the entire can in seconds**
Previously Dehydrated person: MAN THAT WAS 'SO F5!'