Vawulence simply means Violence, it's a Nigerian slang that started as a means of escaping Facebook ban and restrictions in comment section for using the original phrase "violence" that seems to has been blacklisted.
It is the Nigerian term gotten from the word "violence". It refers to toxicity, mostly a fun kind of toxicity among friends and peers, be it in an online gathering or in a multiplayer game.
When trying tofigure out why your uterus hates you, you realize that it worked hard to make something that you aren't using so it then becomes "vagful."