The term 'TWOC' is an acronym for 'Taken Without Owners Consent’ (Taken can be replaced also with 'take') apparently originally used on police documentation, the term has become a popular part of conversation amongst the younger community. The word can be used as simply 'TWOC' or 'TWOC'ed', depending on the situation. The people most likely to be found using this word are young anti-social vandals.
"See that van there?...i'm gonna TWOC it"
"y'know what bill, fuck off. I TWOC'ed your car yeah, but jesus, i haven't heard the FUCKING last of it!"