nubby is a word used to describe incredibly short and ratty people. this term is widely used towards chavs that are short and strange looking.
"look at abbie, shes so ratty, what a nubby slag"
A fat person, or rather somebody chubby.
"Lily looks quiet nubby"
"Wtf is nubby"
"Fat."
husband or boyfriend who has a small penis.
My nubby is a great guy, he just doesn't have much to work with.