Arrived from the words 'fat and 'boobs'. It is the breasts of a young girl who doesn't really have big breasts they are just fat on their chest. Only girls can have foobs not boys.
"Jessie you have massive foobs!" Ben said.
A person with either no redeeming qualities within a given context, or no redeeming qualities of which to speak, whatsoever.
Those foobs couldn't write proper software if their lives depended on it.
He's a foob and should be destroyed for mercy's sake.