Lamech is trolling on Facebook!
We know is that the earth was exceedingly violent and wicked in those days, and so we generally assume that Lamech was a prominent person in this culture, but aside from that we don't know a great deal about this Lamech. To understand a bit better what he was really saying, maybe we need to compare his boast with Isaiah 14:13 - 14, where we are told that Lucifer said in his heart;
"I will ascend into heaven, I will exalt my throne above the stars of God, I will also sit on the mount of the congregation on the farthest sides of the north; I will ascend above the heights of the clouds, I will be like the most high".
Apart from the two being extremely boastful, there is another thing that I can't help but notice; they're both extremely self-centred. After all, how many times does Lamech say "I", "me", "my"? "Adah and Zillah hear my voice", ".. hear my words", "I have killed..."
The passage in Isaiah 14 has some striking similarities, how many times does the devil say "I" or "my"?
If there was something like Facebook around in those days, this would undoubtedly be Lamech's status. Facebook, and social networking in general but especially Facebook, is an extremely selfish culture. It's all about "I", "me" "mine", "I want everyone to know what I think / did" etcetera, it's very rarely about anyone else except the writer (that's a generalisation of course, and there is always the exceptions to the normal, the point here is what is normal). No one in this forum was alive at the time of Lamech, but if there was anything at all like social media around in those days, we'd see that floating around as a status update, and for those of us who don't have Facebook, we would hear about it on the news.
That's what Lamech seems to be doing; he wants everyone to know about him, just like the devil in Isaiah 14:13. Cain was obviously famous and notorious for all the wrong reasons, and Lamech wants to be better.