Booting, or Booting up - To inject, or "shoot up" drugs i.e. heroin. A slang term that is a variant of "shooting up"

To show aggressive behavior towards someone, usually in response to some form of wrongdoing.

Getting dressed and ready to go

another word for having sex.
havin sex with a condom on therefor Bootin up.

When you conceal alcohol in a flask in your boot for consumption to get through a day at work.