Green’s Dictionary of Slang

six-six-six n.

also 6-6-6
[a six figure income, six feet tall, and a penis (at least) six inches long]

the allegedly ‘perfect’ man in terms of (heterosexual) sexual desirability .

r/dataisbeautiful 🌐 Low-hanging fruit: women only want 6-6-6; men just want not-men.
A.N. West ‘Bang the World’ at thebaffler.com Jan. 🌐 This explains the contempt showered on ‘6/6/6 men’ (six figures, six feet tall, and six inches) by those who don’t—ahem—measure up.