Gilby is quite simply put, a fucking alcoholic, You know Gilby is drunk when he is seen staring off into space, laughing at nothing.

A term used to reference cannabis/marijuana/weed.

self-centered piece of shi*or as dani says:)

The term Gilby originated in South Carolina when a red neck man by the name of Gilby made himself famous by creating the world's most alcoholic moonshine. This moonshine was so alcoholic that it had to be sniffed from the end of a match submerged only a tiny amount into it without breathing in or sniffing any of the large amounts of fumes it would create. Unfortunately, on trying this, Gilby was drunk and he ended up sniffing just one tiny bit of the fumes, resulting in his death.

An alcoholic (or someone who has harmed them self from excessive alcohol consumption) is called a Gilby because of this

Gilby - A gilby is an action of someone who is inexperienced with chew tobacco. It is defined as one who has a dip in for less that 10-20 minutes, and then takes it out in shame.

Gilby parties alot. Meets a lot of new people but both won't remember eachother. Gilby has a huge dick but keeps it on the downlow for people he gets close to

Gilby is the term used for someone with a huge fucking dick. The name means 'pledge' in old lingo which obviously is referring to his dick.