According to Thesaurus it's a synonym for "yellow-ish". Online it's mostly used when Non-native English speakers write stories (or roleplays) and try to be ridiculously fancy with their writing style.
"That writer is using 'xanthous' instead of yellow."
"Seriously? If someone uses xanthous in an RP with me I'm gonna block their a**."
Xanthoulakis is the last name of the silliest man you will ever meet. He will spill coffees and curries and trip over rugs, leave his wallet behind at the shops and pass out on the couch with black dildos in his face. Very hard not to love and have a giggle with.
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.
Adjective. Used to describe persons who have adjusted or altered their lifestyle for environmental reasons. Crunchy persons tend to be politically strongly left-leaning and may be additionally but not exclusively categorized as vegetarians, vegans, eco-tarians, conservationists, environmentalists, neo-hippies, tree huggers, nature enthusiasts, etc.
Also used to describe establishments where alternative foods and products are sold, i.e. natural food stores.