3.5 day weekend Share definition Flag when you leave work after lunch the Friday before a 3 day weekend. Bob: Have you seen Jim? Alice: Oh, he took a 3.5 day weekend. You'll have to catch him on Tuesday. 3.5 day weekend by NathanZ June 13, 2007 0 0 Get merch Get the 3.5 day weekend mug. Buy Now — $32.95 See more merch