The root of this word originates from the action of concealing dick and transporting across the border. This is typicallydone with a dick in the ass. This typically requires a gay man or a straight man who hasn't came out yet. But this term has come to mean someone who takes it regularly from illegals or foreign men typically referring to Mexicans.
Ivan goes to Mexico monthly and hooks up with plenty of young Latino men, he is the biggest "cock smuggler" I know.