a dirty little bitch. a snifflely nosed, crusty eyed, coughing, sneezing mess of a human. dogs can be grubskies as well. a grubsky is constantly sniffling and wiping his nose, and often makes a mess when eating.
can also me a term of endearment
that kid john is the biggest grubsky i've ever met...look at him, he is the living, sneezing definition of a snot-nosed grubsky.
awww...look at that dirty little dog... he's such a grubsky.