What's shakin' bacon? spoken language slang
Used as a way of greeting someone, meaning that what's new (with you)?, or what going on?
A: What's shakin' bacon? B: Not much! Just going to supermarket now to buy some food. What are you up to?
A: Good to see you again. What's shakin' bacon? B: Ah! I have been so caught up in my work. All is well. How are you doing?
The origin of this slang is not clear.