the act of being a jibb, to be of below normal standards and having an IQ about the same as Forest Gump. The subject referred as a jibberman usually has poor bowel and bladder control, Noticeable in obvious staining below the waist on their clothes.
"... hey look at that poor jibberman, we should take him to a shelter, or to the zoo...."
When you are in a conversation and you don't know what the fuck the other guy is saying. You either think he/she is confessing that they are homosexual or they are saying a nasty sex position or technique they used
Jason: So yesterday night i sniffed my first queaf and it was ....yadda yadda yadda
i was walking into the lockerroom to get my sports gear when i saw my girlfriend giving head to a teacher while taking it in the ass by the principle so i mummbled "You Jibbering Box A-Cookies" and backhanded that bitch in the face.
jibberjabber means verbal comotion, or talking in a way that annoys anyone present. and can be replied to with the phrase "quit your jibberjabber margo you fool"
"mandy poles arn't they great blah blah blah"
"quit your jibberjabber margo you fool"