To cheat on one's boyfriend, girlfriend, significant other, husband or wife.

When you eat dirt for the first time and leave your family to build a shack in the woods

Have a night out of the house. Usually involves drinking or some other method of distorting reality in a town or city. Also may include rowdy behavior and possibly jail.

to step out...
1)...on ones own or with friends is to go out for a night on the town - clubbing, pubbing, whatever takes your fancy.
2)...with a special someone who is your girl/boyfriend on a date.

leavin to go to a party or a club in a new outfit

Actions related to protecting your rep. Do something that will get noticed because you're being punked off. Generally seen as premeditated instrumental violence vs impulsive and explosive.
Locale: Western Canadian prisons.

Back off.