when a neighbor is entrusted with a set of keys in case one gets locked out of their apartment. The covenant provides the following ;
1) thou shalt not use the keys to obtain food from thy neighbors' refrigerator
2) thou shalt not use thy neighbors' bathroom unless first asking permission (even if yours is broken)
3) thou definitely shalt not be in thy neighbors' apartment when said neighbor is bringing home a date
4) if thy covenant is broken, then the offending party must pack up his/her belongings and move to California where he/she will probably end up being accused of murder (see The Ten Commandments )
A keybanger is to coast along in an manual carby'd car with the engine off pumping the go pedal 3-4 times then with the car in gear dropping the clutch causing the car to 'roll start' causing a great bang to show you mates you need a new muffler.
OMG I shouldn't have done that keybanger, I need a newmuffler now eh uleh?