1) A term referring to high-grade marijuana with superior buds. When growers dry their cannabis by hanging it upside down from a line, the marijuana tends to collect more resin and crystals in the colas. Growers use this term to indicate the quality of said buds.

2) A varation of "indo", which refers to cannabis grown indoor in a highly controlled environment.

"Bro, I have some dank endo right now. It will knock your socks off."