Confirming plans only to then bail out last minute or go completely missing with a suspect/weak/epic excuse.
Also to pull a 'leonard'
"Where's Nick? He seemed so up for it and has been banging on for weeks that he was 100% going to be here but he's not here."
"Ah, he's probably leonarding / pulling a leonard"
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.