Gackly
A way of showing you're totally sure, but it sounds like you're talking to a goat.
'Gackly, I'm the goat!', said by a kid who just got beat up by a goat.
'Gackly, I'm the best!', said by a kid who just lost the race.
'Gackly, I'm gonna eat you!', said by someone who just had a sandwich.