What does "THUG LIFE" stand for?

From the text:

“’ Pac said Thug Life stood for ‘The Hate U Give Little Infants Fucks Everybody.’”

I raise my eyebrows. “What?”

“Listen! The Hate U— the letter U— Give Little Infants Fucks Everybody. T-H-U-G L-I-F-E. Meaning what society give us as youth, it bites them in the ass when we wild out. Get it?”