A word designed by the misinformed ethnic rev head.
Meaning the item is not stock, could either be an after market or a "worked" item.
Generally ment to be "worked" yet non of them know what gets done or actually got it done as it was always done prior to purchase.
"yeah bro i got a cat back zorst system a big cooler and a high flow turbo bro."
"nah bro its been high flowed uleh."
"my high flow vl will munch your skyline for breakfast mate."