The moment when you attempt to fart silently in the presence of a female and a little faeces comes out.
Can also be used as an exclamation when the above situation arises, and or as an insult whereby you intend to refer to the insulted as a piece of poo that was never intended to come out of the anus.
Oh no I've just badger wack'd in front of Suzie and I need to go home and change my wide fronts.
Someone who is a complete know-it-all on a particular topic is referred to as a badger. This is usually used as a insult and a basic indicator to remind them to shut the fuck up.
Steve: “The ils is an abbreviation for the instrument landing system this system is used to...”