The quote expresses a strong sense of distrust towards someone, implying that the speaker would not rely on them even in the most critical situation, like a last chance for survival. It highlights the speaker's lack of confidence in the person's reliability or integrity, suggesting they would rather face danger alone than depend on this individual.

"I wouldn't trust you if you were the last life raft leaving the Titanic."

This vivid metaphor emphasizes how untrustworthy the speaker perceives the person to be, comparing them to a critical lifeline in a perilous scenario. The quote is from the book Fang by James Patterson, reflecting a tense or confrontational moment between characters.