The perfect time (PM) to have a huge party to celebrate the end of school and the start of summer while your parents are out of town for the weekend. Just make sure the beer delivery guy doesn't arrive early and blows the whole plan, know what I'm sayin'?
Made famous by Richard Linklater's 1993 movie "Dazed and Confused".
Slater: "What time is your party tonight, man?"
Pickford: "9:30, man"
Slater: "9:30... Mmm.. Okay.. I'll be there, man"