The phrase "absolute cracker" is used to describe something outstanding or excellent. It means that whatever is being referred to is really good. Full definition
Absolute cracker of a game with both result and performance from Arsenal keeping our chances of a top four finish well and truly alive. (justarsenal.com)
I'm an absolute cracker fiend, with an addiction to Vita - Weat 9 Grain crackers. (superfoodie.live)
Tis going to be an absolute cracker of a season and I pray to God that the lads are up for it. (justarsenal.com)