look up any word, like cunt:
 
1.
Half a gram of marijuana (0.5G) normally sold for $5. Also commonly referred to as a nickel sack.
"Yo nigga I got 5 bucks, lets grab a 5 piece."
by DarkCore May 25, 2009
 
2.
1. A fist that someone uses to fight another person.
2. Scott when he's pissed.
3. A threat word.
4. Something that you give to someone to show 'em who's boss.
Yo fool you best shut up or I'll give some a my 5-Piece!
by Matt157 February 12, 2009