from מָצַץ in the sense of greedily devouring for sweetness; properly, sweetness; concretely, sweet (i.e. not soured or bittered with yeast); specifically, an unfermented cake or loaf, or (elliptically) the festival of Passover (because no leaven was then used); unleaved (bread, cake), without leaven.
from שָׁמַן; grease, especially liquid (as from the olive, often perfumed); figuratively, richness; anointing, [idiom] fat (things), [idiom] fruitful, oil(-ed), ointment, olive, [phrase] pine.
TRV