Basically the same as "homie" "Holmes" "N*gga" Whatever floats your boat, i don't mean the N word rascally, just as another synonym for "homie". I just personally think Duco sounds better, i recall hearing it more in NYC and origins may be of mexican or latin (american) heritage).

******side note, some use as one of those words you can replace any noun with the said word...(duco).

Got the covid-19 vaccine

you and your partner's sexual fantasy combined into some hardcore stiff cock riding action all freakin day

to defaecate

Playing runescape throughout the early morning hours after having consumed a large amount of alcohol.

A name for a cool person