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1.
To do an intensive, rigorous investigation or creeping of a particular person or thing (especially via facebook).
She doesn't list her relationship status on facebook. I'mma have to deep creep her when I get home.

Seriously, there's no more sesame bagels left? Did you deep creep in the back to check?
by Nicholasraj November 21, 2010
 
2.
doing extensive research (i.e looking at all their pictures and statuses)on a specific person on a social media website like FB or Twitter
I had to deep-creep on Alex's boyfried on FB and looked at all the pictures! He's a douche!
by Lisa Durham July 25, 2011