Psalm 50:13, "Will I eat the meat of bulls, or drink the blood of goats?" is a rhetorical question meant to challenge a misunderstanding of God's needs and desires. It's part of a larger critique of empty rituals and sacrifices. Here's a breakdown of its meaning:

Rhetorical Question: The question doesn't expect a "yes" answer. It's meant to make a point.
Challenging Misconceptions: The verse challenges the idea that God is hungry or thirsty and needs offerings of meat and blood to sustain Him. It confronts the superficial understanding that mere physical acts of sacrifice are sufficient to please God.
God's Self-Sufficiency: It emphasizes God's self-sufficiency and independence. He doesn't require anything from humanity. He owns everything (Psalm 50:10-12), so He doesn't need sacrifices for nourishment.
Focus on Inner Transformation: The psalm is a broader call to true worship, which involves a changed heart, obedience, gratitude, and righteous living, rather than just going through the motions of external rituals.
Spiritual Significance: God desires heartfelt gratitude, sincere repentance, and righteous living, not just animal sacrifices. The sacrifices were meant to be symbolic of these things, but they had become empty rituals for many.

In essence, the verse highlights that God values inner transformation and genuine worship over mere external acts of sacrifice.