It's a Pump.

I came across this article on the CNN website.

A man was travelling to Iran with his mother. He was stopped at the security checkpoint after security guards found an object that resembled a grenade. Not wanting his mother to learn of the object he had brought in his carry-on, he whispered to the security guard "It's a pump." The guard mistakenly heard "It's a bomb." He is now facing disorderly conduct.

The object he had brought with him was a penis pump that he desperately did not want his mother to learn about. Despite his reluctance to reveal it to his mother he feels it is not an unusual object to own. "It's normal. Half of America they use it."