To secretly obtain information
Pull A Castro. Darnel (after plucking hairs from Little Chubby through the toilet plumbing): "I had to do the same thing to Castro. This was a walk in the park compared to that."
Little Chubby (seeing the missing hairs): "(the) bastard pulled a Castro on me!"
When you pluck one of someone's pubes without them knowing, for one reason or another. (Popularized by the NBC show, My Name Is Earl.)
Guy 1-"Damn guy had to pull a Castro on me to get my DNA to test to see if I was his son's real father!"
Guy 2-"Ouch!"
to buy something really stupid at a really expensive price
Friend: How much was that solid white sweatshirt?
Other friend: $200
Friend: Dude! You totally pull a castro!