It is a sexual term. That you use it in a perverted way or slang as you did shows your lack of emotional control. Or maybe because its the cool thing the kids are saying these days you think it's appropriate and don't know any better.
At any rate, you're straw-manning about smoking. I'm guessing you haven't had a close family member die of cancer caused by smoking because you'd understand the realities of it. I have. Thus I've seen what it can do and I understand the devastation it causes. Your suggestion that cancer caused by smoking is a belief is callous, naive and an insult to those who've had it or witnessed others who've had it.
Getting back to the original argument, which you seem to have trouble staying on, there is no experiment I can conduct or documentation I can read which proves conclusively evolution exists.
I think you struggle with this (evolution) as your belief but are happy to attack others who have a different belief because you think you have all the facts. As such, you are happy to link me to the slang filled urban dictionary but provide no real source of conclusive studies on evolution.