1.)Google penalizes a website for buying and selling links.
2.)Google penalizes a website for being misleading such as having stealthy links or scripts.
I got Google slapped for selling links to a website selling Viagra.
Unlike the "google slap" which means the company GOOGLE is punishing a website- this term is used when someone says something really questionable as if they knew what they were talking about and someone googles the facts and then slaps them publicly with the proof they are full of shit.
Dan said that Obama was actually born outside the USA. I googled it and then publicly humiliated him for his ignorance. I google slapped him.