The act of using your brain to make a decision.

When you think about a decision and make the right choice. Like a no-brainer but better.

A Brainer is when you do something because it had to be done and you knew it was the right thing to do.

A word used by senior stagiaires who are trying to look cool. While the validity of the word is contested, it is accepted that the word is not used by anyone anymore, or at least anyone who you would consider to be cool.

The act of exhaling Marijuana from one persons mouth to another persons mouth, to be then inhaled.
See also: Shotgun.

brainer or brain boner is when something satisfies the mind in a way to the extent of giving a mental erection.

When you're attracted to somebody primarily based on their personality and mind rather than appearance (although that does help).