Anybody who believes that the way to a man's heart is through his stomach flunked geography.

Byrne riffs on the old proverb that “the way to a man’s heart is through his stomach,” twisting it into a joke about anatomy and “geography.” The punchline implies that anyone who takes the proverb literally has mistaken the heart’s location—suggesting they “flunked geography” (i.e., don’t know where things are). Beyond the anatomical gag, the line satirizes simplistic formulas for affection or influence: love and intimacy are not reducible to feeding someone. The humor depends on deflating a sentimental cliché with pedantic literalism, a common strategy in modern aphoristic comedy.