"hey bro" is the act of taking a picture of a girls ass/boobs.
"hey bro" is used because girls don't understand it when it is used, so it can be used even when in the vicinity of the girl whose ass/boobs you want to take a picture of.
the album in which you keep the pictures of ass/boobs you have taken.
dude, i used my camera phone to "hey bro" that girl
I just added sally to the "hey bro" folder on my computer
Hey bro, do you think you could get to work rather than just sitting around enjoying your coffee.
How to spot them: Young man, age 19-24. potentially from Bakersfield. Wears clothing from American Eagle or Abercrombie and Fitch. The 'hey bro' attempts to ironically wear pink. Drives a lifted truck, IROC Z28, or Miata convertible. Enjoys bands like Disturbed, Fall Out Boy, Avenged Sevenfold and the Dave Matthews Band (despite none of those bands sounding alike). They honestly believe that at Karaoke they have a chance with the ex-stripper "Bud Light Girls" because they won a mesh cap as a prize from a Lynyrd Skynyrd trivia contest. They drink more red bull than water. Flip flops, cargo shorts, polo shirts, half beards, and Cuban dictator hats count as "Semi Formal" to them. They are amused by the Dave Chappelle one liners "I'm Rick James Bitch!" and "Oh KAY!" They are probably wearing a pair of aviator sunglasses.
"Whoa bro, good idea.."