XXXTENTACLES

It's a nickname of XXXTENTACION, it was created by himself during a video where he showed his muscles while boxing with one of his friends.
It means that his muscles are so big that he can use them like tentacles.

(The tentacles of polyps are known for beign really strong.)

"I'm going to beat his ass up because i'm XXXTENTACLES NIGGA!"

by thetentacle July 02, 2018