One whom is queer beyond all belief with many STD's and other undesireable diseases. Generally boberts have the intelligence of a vegetable and are considered "Less than Everything" -- Yes even less than dirt.
Portmanteau nickname of "Bob" and "Robert." Typically used in a derogatory manner and/or by the less intelligent, who think it's funny. Best used ironically in a tone of voice that sounds slightly screechy or with stereotypical "Autistic screeching" accompanying. Non-ironic case usages typically signify bad sense of humor.
Nick: Hi Bobert!
Robert: For the fifth fucking time, it's not funny! Cut that shit out!