It is duel purpose term that can be used to express a mans gayness or a woman's sluttiness. Essentially you pointing out that that person has sex with an abundance of men.
Jake: Look at those guys holding hands...
Mike: Fuckin dudebangers.
Sam: I slept with jenny last night.
James: That's not much of an accomplishment seeing as how she's a dudebanger and all...
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.