Definition

Street slang for a smoking device or blunt, wrapped up in casual profanity for maximum nonchalance. When you want to reference your paraphernalia without being too obvious about it.

Example Usage

We were just chilling out back with the mf yeah before the concert started.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=The%20mf%20yeah&defid=14565821)