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1.
A totally and completely useless individual whose sole purpose in life is to stand there and look good. They have the potential to do something useful, but just won't. Chromos generally go to great lengths to avoid responsibility. They are usually very self-centered, incredibly dense, impulsive liars, and are almost always undeniably hot.

Believe it or not, this term comes from the word "chromoplast," an organelle within a plant cell that is created once a chloroplast dies. Chromoplasts, like chromos, are useless. They only provide nice colors for the plant, hence the general hotness of chromos.
My ex-boyfriend is such a chromo!
by kj G. January 29, 2006
 
2.
Any useless, annoying individual. The word implies low intelligence and social status, and/or lack of moral values.
Only moderately insulting, the term conveys the idea that the person thus designated is looked-down on, but not hated. Comes from chromosome, hinting that the insultee might be missing a few.
1. Jean l'agent, c'est un chromo.
(John the security guard is a chromo.)
2. Ces chromos-là m'ont vendu le mauvais gugusse.
(Those chromos sold me the wrong gizmo.)
3. Est verte, chromo!
(It's green, chromo!)
by LB7979 June 14, 2007
 
3.
"Window licker", "spakka", "spastic"

A substandard human being missing a chromasone, like a downs syndrome.
Damien Duff looks like the fucking chromo who scores the penna off the advert. The ugly cunt.
by Damien Duff's mam July 10, 2003