Leonbaring 

a typical Hurensohn

Look! The Hurensohn Leonbaring is over there!

Leonbaring by miketyson November 21, 2021

leonarding

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"

leonarding by seanshouse November 7, 2013