Boi is a term for black transgender and/or non-binary people. It similar to boy but is separate from the white/western gender binary. The name draws inspiration from African American Vernacular English (AAVE).
Flag
Boi was coined on June 6, 2015 by Tumblr user Vmerli[1]. The flag was created by BoiQirl through a submission to ask-pride-color-schemes on February 2, 2017[2].
The flag uses greenish blue, showing that it is similar to boy, which is associated with blue, but it is still its own separate thing. The three stripes in the middle are intentionally different from the middle stripes of the qirl flag, showing that the two are not meant to be “opposites” of each other.