Ladavoochery
Ladavoochery is when lads get together and swear they're going to be the biggest troublemakers, and then try to make each other do it.
'You better be the one who gets in trouble, or I'll tell your brother.'
'If you don't shout at the barmaid, I'll throw your chips on the floor.'
'You're not a real lad unless you're the biggest fool.'