Goober is the last bit of a bottle of coke which nobody wants because it has
gone a bit salivery, the common cause of this is from the direct application of the
lips to the coke bottle, resulting in a bit of saliva entering the coke bottle with each
sip.
N.B Goober can form in any drink bottle, not neccesarily coke.
"I'
ll pay you 10 bucks if you drink the goober out of that coke
bottle"
"I don't want to drink that, Its got goober in it"