How do you know you have product market fit?

product market fit is when you simultaneously have predictable customer acquisition but also have no idea where new customers are coming from.

lumpy sales? nope. sales whenever you "Ring the Register" at Facebook or your email list? haha.

product market fit is when the market looks for your product and finds it. and it's the point at which marketing becomes centric to helping and maintaining vs smashing people over the head with a pitch hammer.