I like the expression “by the way” but what does it mean?
("by the way" has been used as a prepositional phrase meaning literally "alongside the road")
We should change it. Next conversation you mention “and by the way, your mom is really really hot.“

Change it to these variations, keeping in mind they should all get you punched in the face:

Incidentally your mom is really really hot. ( That is the literal (non funny) meaning)
Next to some curd, your mom is really really hot. (that is the “whey” variation)
By the whale, your mom is really really hot. Makes there mom look fat and sexy.
Buy the whey, your mom is really really hot. (this one would be better if your either in a store holding whey, or maybe just writing it in a letter.)
Is your mom a hooker? Because she was by the way.