1. Taking a picture of your dick or asking someone else to. Often said or requested when someone is already taking a picture.
2. Snapping a dick pic
1. She's so thirsty , I'm gonna take one of the captain .
2. Boyfriend: hey, I'm gonna send you some selfies tonight.
Girlfriend: don't forget to take one of the Captain Too ;)
Boyfriend: Only if you send me some too
Girlfriend: Deal!