"King Kirk" is the name given to a TImeline Gamma variant that is mostly known for a singular video. He is called King Kirk because his actual name is unknown, and he is seen wearing a Burger King cardboard crown in the video he is actually known for.
The video that is referenced when there actually is discussion of King Kirk is a video of him sitting in an airplane, clearly angry with someone. That doesn't sound too bad until you hear him say a racial slur on a plane directly to a black flight attendant. The flight attendant is quite calm even after being called a slur by a presumably showerless racist, as all she does is politely tell him to stop because they are children on board the plane. Obviously, he doesn't.
King Kirk is rarely discussed by Kirkian scholars due to the seeming unimportance of this variant, and because it's quite vulgar. Although, there are some more underground scholars who touch upon this variants and others that are similar. Many of them discuss such variants because there is a controversial conspiracy theory relating to the nature of them.
On a much more professional note, many actually accepted scholars have decided that the scarcity is this variant may be linked to Timeline Gamma itself and that it's actually story is just the same as David Leroy Carter, as the variant seems to be a kirkified version of him. Though some claim this still doesn't fully make sense because it would make much more sense for this variant to be in Timeline Beta instead of Gamma.