The word Jihad has no only one meaning. We recognize four types of Jihad and one of them is "Jihad by the sword", which means that the Islam religion can be spread with violence. The expression "Jihad bomb" is connected with that sword type of religion spreading. From this side of view it is correct and it's not like we make laugh of Islam religion. Anyway, you're visitor on our servers, so you should accept this as same as we have to accept habits of your state when we are visitors on yours servers.