Some one who if they can't have something destroys it rather than letting some one else have it. From the to common habit of some I.T. people of destroying decommissioned equipment, instead of putting it in recycle. A update of a dog in a manger.
What's the difference between an I. T. guy in a manger and a dog? The dog eventually leaves , and the other animals get use of the manger, the I.T. guy pisses and shits in it so on one can use it.