When people say something is cracking, they usually mean it is really fun or going great. People in Britain and those talking online use this word a lot. For example,e if someone says the party was cracking, ng it means the party was really fun and lively. You can also use cracking to describe someone who has a lot of energy,rgy like saying she is in cracking form today. Sometimes,mes when people say get cracking, they mean you should start doing something and do it with a lot of excitement. What cracking means can depend on how someone says it and what is happening. Mostly, cracking is a good thing to say about something, like a party, a performance, or how someone is doing.