To lay it on thick so to speak with words of admiration. To have strong feelings towards another. To crave someone or have lustful thoughts about them.
Saucing is when you cum all over a female. Whether it's on her back side, tummy, face or if it's really serious and she doesn't want to waste the "Sauce" then she'llhoover it in the mouth.
Ooooh man it's been a long weekend! I was "saucing" all over the place.