Magnatize simply means Hooking up, or "having sex" in old school terms. Magnatize is a clever term most often used in the club scene as a way for a man to inform his current dance partner he would like to proceed in inserting his cock into at least one of her sex holes sometime that night.
(Random Techno music in the background)
Man: "Hey baby, you wanna magnatize"
Blonde: "Wow, you're classy. Of course I want your meat plowing me, but only if you promise to empty your balls in my mouth.
The Snowman is the age old tradition of ejaculating on a female's face and upper body. The term Snowman is best used when the male has a massive amount of cum, and proceeds to spray man juice on the female; covering her face and getting as much as possible on her tits/neck area, resulting in Snowman like features.
Special note: To better grasp the term Snowman, think Bukkake, but from one man.
Dude, I totally gave katrina The Snowman last night. Check out this pic I saved on my phone, you can't even tell it's her anymore.