ranking,rankin',etc. can also mean someone is hiding their affiliations, not representing their Identity when asked , usually by a rival gang when a gang member is in the wrong varrio,hood, or turf.
"eh holmes , where you from, eh?"
"um, nowhere , eh. uh, uh "
"tskchhhh, Chale!, holmes,you're focken RANKING esse."
adj. Used to describe something of superiorquality. Not to be confused with 'dank', which is of lesser significance.
Homie: "Yo, something smells rank up in here!"
Cuz: "Yea man, check this out. I got that barbecue chicken pizza, add bacon, add jalepeno, everything crust with extra salt. So rank bro."
Homie: "So rank cuz, can I have a slizz?"