To prepare for a night of drinking at bars and clubs by drinking at home first, in order to already have a good buzz going before you get there. Cost effective.
Hey man, come by my place around 6 and we can preflight before we hit the club.
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Prior to boarding a plane, those who get nervy or have irritable bowels try and drop one in the toilet. Occasionally they do actually just need to take a crap..
"Hey, where you been? Planes boarding!!"
"Sorry man, had to conduct a few preflight checks, gonna be a long flight"