eyeball

To check the quantity of illicit substances without the use of a gram scale.

1) (vt) to stare at another with intent to threaten or insult

2) (vt) to measure by visual estimate

Prison slang for anus or anal virginity

Attempting to guess the weight of one's marijuana simply by looking at it when one is silly enough to forget thy scales

Verb.
To eyeball is to drink vodka or other spirits through one's eyes - the alcohol gets into the bloodstream quicker this way.
Notable for being mentioned in the film "Kevin and Perry Go Large". The potential risks of eyeballing are also shown in this film - losing one's eye, blood poisoning, alcoholism.

A warden of Irish decent. This being is only capable of carrying out one mundane task at a time, such as pressing door entry buttons, chain smoking strange branded cigarettes, or answering the telephone.
Eyeball is easily identified by his flaking skin, bedraggled appearance, and strange odour of TCP. Special abilities include the making of super strength tea, and talking loudly during good television programmes.

Used originally for people using the website goeyeball.com to price monitor items and save money during the recession of 2009. A more broad definition as someone who knows how to save and keeps an eye on sales.