What does ofwgkta mean?

OFWGKTA stands for Odd Future Wolf Gang Kill Them All, its a rap group.

Wikipaedia says

Odd Future Wolf Gang Kill Them All, often abbreviated OFWGKTA and also known simply as Odd Future, is an alternative hip hop collective from Los Angeles, California. The group is led by rapper/producer Tyler, The Creator, and includes rappers Hodgy Beats, Earl Sweatshirt, Domo Genesis and Mike G, singer Frank Ocean, producers Left Brain, Syd tha Kyd and Matt Martians, and other non-musical members (non-rappers who have features on group's mixtapes and Tyler's albums), notably Jasper Dolphin and Taco Bennett.