Derived from stumbling over your words when you can't decide between "see you later" and "talk to you later" and end up sounding like an idiot trying to say both at once. Deliberately blending the two turns a social faux pas into an ironic commentary on postmodern friendships.
Chet: Alrigh', dude. I'm out.
Allen: Stalk you later, man.
Chet: Whoa, you're right. Modern technology and microblogging makes us all stalkers of each other.