Manjack: an individual of either sex, or any age in the Caribbean (Barbados) dialect.

A man who messes around with other men, but no one would ever know by looking or talking to him. Used by gay black men to identify masculine gay men or DL Brothas.

A turd so large that it contacts the bottom of the U-bend while still emerging from the unfortunate crapper's anus, causing him/her to be literally jacked up off the seat. There is a particular risk of manjack when using toilets of the curious German or Austrian design, which have the U-bend at the very front of the pan and a shallow "deck" for inspection of stools.

urban legend. fictitious homosexual pervert who preys on young boys. name originates from his favorite action to perform on his victims.