I only found out about this today and it’s because I got the medal some days ago:
The Sneak King medal is awarded to players for back smacking players who have camo on, the medal name makes sense, but as it turns out, the name is (most likely) based on a video game Burger King commissioned with Microsoft in 2006, consisting on having the Burger King mascot sneaking behind random people and offering them Whopper burgers. The title? Sneak King.
Sources:
https://streamable.com/35vocp
https://en.wikipedia.org/wiki/Sneak_King